Revert "When CQ-master destructs itself, it needs to record ignored slaves."

This reverts commit c034a38e7c53335bf844b4912aa54560739c3a1d.

Reason for revert: chromium:711554

Original change's description:
> When CQ-master destructs itself, it needs to record ignored slaves.
> 
> When self-destruction is triggered, for each uncompleted slave builds,
> the master build will insert a message with the slave build_id as the
> value into the buildMessageTable. The slave builds may pass, fail or
> abort after the master destructs itself.
> 
> BUG=chromium:707894
> TEST=unit_tests
> 
> Change-Id: I75e4d946cd51600343ebda94fe58438a6837d159
> Reviewed-on: https://chromium-review.googlesource.com/471849
> Commit-Ready: Ningning Xia <nxia@chromium.org>
> Tested-by: Ningning Xia <nxia@chromium.org>
> Reviewed-by: Aviv Keshet <akeshet@chromium.org>
> 

TBR=dgarrett@chromium.org,akeshet@chromium.org,davidriley@chromium.org,nxia@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:707894

Change-Id: Iee1c46f8ab205aa0e5a6fb8aa415f09888c1ce9a
Reviewed-on: https://chromium-review.googlesource.com/477440
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Ningning Xia <nxia@chromium.org>
diff --git a/cbuildbot/build_status.py b/cbuildbot/build_status.py
index 9e6cd5c..49f7f25 100644
--- a/cbuildbot/build_status.py
+++ b/cbuildbot/build_status.py
@@ -305,18 +305,6 @@
     """
     return len(self.completed_builds) == len(self.builders_array)
 
-
-  def _GetUncompletedBuilds(self, completed_builds):
-    """Get uncompleted builds.
-
-    Args:
-      completed_builds: a set of config names (strings) of completed builds.
-
-    Returns:
-      A set of config names (strings) of uncompleted builds.
-    """
-    return set(self.builders_array) - completed_builds
-
   def _ShouldFailForBuilderStartTimeout(self, current_time):
     """Decides if we should fail if a build hasn't started within 5 mins.
 
@@ -445,17 +433,6 @@
         metrics.Counter(constants.MON_CQ_SELF_DESTRUCTION_COUNT).increment(
             fields=fields)
 
-        # For every uncompleted build, the master build will insert an
-        # ignored_reason message into the buildMessageTable.
-        uncompleted_builds = self._GetUncompletedBuilds(self.completed_builds)
-        for build in uncompleted_builds:
-          if build in self.all_cidb_status_dict:
-            self.db.InsertBuildMessage(
-                self.master_build_id,
-                message_type=constants.MESSAGE_TYPE_IGNORED_REASON,
-                message_subtype=constants.MESSAGE_SUBTYPE_SELF_DESTRUCTION,
-                message_value=self.all_cidb_status_dict[build].build_id)
-
         return False
 
     # We got here which means no problems, we should still wait.
diff --git a/cbuildbot/build_status_unittest.py b/cbuildbot/build_status_unittest.py
index a620c39..7b54889 100644
--- a/cbuildbot/build_status_unittest.py
+++ b/cbuildbot/build_status_unittest.py
@@ -234,11 +234,6 @@
                             '_GetNewSlaveCIDBStatusInfo',
                             return_value=cidb_status)
 
-  def _MockGetAllSlaveCIDBStatusInfo(self, cidb_status=None):
-    return self.PatchObject(builder_status_lib.SlaveBuilderStatus,
-                            'GetAllSlaveCIDBStatusInfo',
-                            return_value=cidb_status)
-
   def _Mock_GetSlaveStatusesFromBuildbucket(self, buildbucket_info_dict=None):
     self.PatchObject(builder_status_lib.SlaveBuilderStatus,
                      'GetAllSlaveBuildbucketInfo')
@@ -390,24 +385,6 @@
                      set(['passed', 'failed', 'aborted', 'skipped',
                           'forgiven']))
 
-  def testGetUncompletedBuilds(self):
-    """Tests _GetUncompletedBuilds"""
-    self._Mock_GetSlaveStatusesFromCIDB(CIDBStatusInfos.GetFullCIDBStatusInfo())
-    self._Mock_GetSlaveStatusesFromBuildbucket(
-        BuildbucketInfos.GetFullBuildbucketInfoDict())
-
-    slave_status = self._GetSlaveStatus(
-        builders_array=self._GetFullBuildConfigs())
-
-    completed_builds = {'completed_success', 'completed_failure',
-                        'completed_canceled'}
-    self.assertEqual(slave_status._GetUncompletedBuilds(completed_builds),
-                     {'scheduled', 'started'})
-
-    completed_builds = {'completed_success', 'completed_failure'}
-    self.assertEqual(slave_status._GetUncompletedBuilds(completed_builds),
-                     {'scheduled', 'started', 'completed_canceled'})
-
   def testGetRetriableBuildsReturnsNone(self):
     """GetRetriableBuilds returns no build to retry."""
     self._Mock_GetSlaveStatusesFromCIDB(CIDBStatusInfos.GetFullCIDBStatusInfo())
@@ -1011,23 +988,19 @@
 
   def testShouldWaitWithTriageRelevantChangesShouldWaitFalse(self):
     """Test ShouldWait with TriageRelevantChanges.ShouldWait is False."""
-    self._Mock_GetSlaveStatusesFromCIDB(CIDBStatusInfos.GetFullCIDBStatusInfo())
-    self._MockGetAllSlaveCIDBStatusInfo(CIDBStatusInfos.GetFullCIDBStatusInfo())
-    self._Mock_GetSlaveStatusesFromBuildbucket(
-        BuildbucketInfos.GetFullBuildbucketInfoDict())
-
     relevant_changes.TriageRelevantChanges.__init__ = mock.Mock(
         return_value=None)
     self.PatchObject(relevant_changes.TriageRelevantChanges,
                      'ShouldWait', return_value=False)
     self.PatchObject(build_status.SlaveStatus,
-                     '_Completed', return_value=False)
+                     '_Completed',
+                     return_value=False)
     self.PatchObject(build_status.SlaveStatus,
-                     '_ShouldFailForBuilderStartTimeout', return_value=False)
-    self.PatchObject(build_status.SlaveStatus, '_RetryBuilds')
+                     '_ShouldFailForBuilderStartTimeout',
+                     return_value=False)
     pool = validation_pool_unittest.MakePool(applied=[])
     slave_status = self._GetSlaveStatus(
-        builders_array=self._GetFullBuildConfigs(),
+        builders_array=['slave1', 'slave2'],
         config=self.master_cq_config,
         version='9289.0.0-rc2',
         pool=pool)
@@ -1036,15 +1009,6 @@
     self.assertTrue(slave_status.metadata.GetValueWithDefault(
         constants.SELF_DESTRUCTED_BUILD, False))
 
-    build_messages = self.db.GetBuildMessages(self.master_build_id)
-    self.assertEqual(len(build_messages), 3)
-    for m in build_messages:
-      self.assertEqual(m['message_type'],
-                       constants.MESSAGE_TYPE_IGNORED_REASON)
-      self.assertEqual(m['message_subtype'],
-                       constants.MESSAGE_SUBTYPE_SELF_DESTRUCTION)
-      self.assertTrue(m['message_value'] in (1, 3, 4))
-
   def testShouldWaitWithTriageRelevantChangesShouldWaitTrue(self):
     """Test ShouldWait with TriageRelevantChanges.ShouldWait is True."""
     relevant_changes.TriageRelevantChanges.__init__ = mock.Mock(
diff --git a/lib/constants.py b/lib/constants.py
index 8ea10ac..fc9274e 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -710,10 +710,6 @@
 SUBSYSTEM_FAIL = 'subsystem_fail'
 SUBSYSTEM_UNUSED = 'subsystem_unused'
 
-# Build messages
-MESSAGE_TYPE_IGNORED_REASON = 'ignored_reason'
-MESSAGE_SUBTYPE_SELF_DESTRUCTION = 'self_destruction'
-
 # Define HWTEST job_keyvals
 DATASTORE_PARENT_KEY = 'datastore_parent_key'
 
diff --git a/lib/fake_cidb.py b/lib/fake_cidb.py
index a77c42f..5844cc2 100644
--- a/lib/fake_cidb.py
+++ b/lib/fake_cidb.py
@@ -30,7 +30,6 @@
     self.failureTable = {}
     self.fake_time = None
     self.fake_keyvals = fake_keyvals or {}
-    self.buildMessageTable = {}
 
   def _TrimStatus(self, status):
     """Trims a build row to keys that should be returned by GetBuildStatus"""
@@ -181,41 +180,6 @@
     self.failureTable[failure_id] = values
     return failure_id
 
-  def InsertBuildMessage(self, build_id, message_type=None,
-                         message_subtype=None, message_value=None, board=None):
-    """Insert a build message.
-
-    Args:
-      build_id: primary key of build recording this message.
-      message_type: Optional str name of message type.
-      message_subtype: Optional str name of message subtype.
-      message_value: Optional value of message.
-      board: Optional str name of the board.
-
-    Returns:
-      The build message id (string).
-    """
-    build_message_id = len(self.buildMessageTable)
-    values = {'build_id': build_id,
-              'message_type': message_type,
-              'message_subtype': message_subtype,
-              'message_value': message_value,
-              'board': board}
-    self.buildMessageTable[build_message_id] = values
-    return build_message_id
-
-  def GetBuildMessages(self, build_id):
-    """Get the build messages of the given build id.
-
-    Args:
-      build_id: build id (string) of the build to get messages.
-
-    Returns:
-      A list of build messages (in the format of dict).
-    """
-    return [v for v in  self.buildMessageTable.values()
-            if v['build_id'] == build_id]
-
   def StartBuildStage(self, build_stage_id):
     if build_stage_id > len(self.buildStageTable):
       return