[Autotest][COIL] updates to site_utils/deployment/*

Replacing master --> main

BUG=b:169251128
TEST=None, comment changes only

Change-Id: I08fc8c02f293c02cf2d1956a36e92e50cc100e2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2601720
Tested-by: Derek Beckett <dbeckett@chromium.org>
Auto-Submit: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Greg Edelston <gredelston@google.com>
Commit-Queue: Greg Edelston <gredelston@google.com>
diff --git a/site_utils/deployment/cmdvalidate.py b/site_utils/deployment/cmdvalidate.py
index 60ee9a0..cbd228e 100644
--- a/site_utils/deployment/cmdvalidate.py
+++ b/site_utils/deployment/cmdvalidate.py
@@ -177,6 +177,11 @@
     # an error message.
     if board is None:
         return False
+
+    # TODO b:169251326 terms below (and in the comment above) are set outside
+    # of this codebase and should be updated when possible.
+    # ("master" -> "main")
+
     # Check Google storage; report failures on stderr.
     if _build_path_exists(board, 'LATEST-master'):
         return True
diff --git a/site_utils/deployment/install.py b/site_utils/deployment/install.py
index 69c6909..c837294 100644
--- a/site_utils/deployment/install.py
+++ b/site_utils/deployment/install.py
@@ -315,12 +315,12 @@
     @return A true value if the host is idle at return, or a false value
         if the host wasn't idle after some reasonable time.
     """
-    # We need to talk to the shard, not the master, for at least two
+    # We need to talk to the shard, not the main, for at least two
     # reasons:
-    #   * The `abort_special_tasks` RPC doesn't forward from the master
+    #   * The `abort_special_tasks` RPC doesn't forward from the main
     #     to the shard, and only the shard has access to the special
     #     tasks.
-    #   * Host status on the master can lag actual status on the shard
+    #   * Host status on the main can lag actual status on the shard
     #     by several minutes.  Only the shard can provide status
     #     guaranteed to post-date the call to lock the DUT.
     if afe_host.shard: