Add parrot-release-group builder.

BUG=chromium:322107
TEST=All unit tests.

Change-Id: I69dcd6e7e7420098265abd504d3798eecef10059
Previous-Reviewed-on: https://chromium-review.googlesource.com/179329
(cherry picked from commit b37120b62d84297ad02a9a67d44ea604f585874a)
Reviewed-on: https://chromium-review.googlesource.com/179787
Reviewed-by: Dharani Govindan <dharani@chromium.org>
Tested-by: Dharani Govindan <dharani@chromium.org>
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index eb595db..aea4eee 100755
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -1697,8 +1697,13 @@
   vm_tests=None,
 )
 
-_release.add_config('parrot-release',
-  boards=['parrot'],
+_release.add_group('parrot-release-group',
+  _release.add_config('parrot-release',
+    boards=['parrot'],
+  ),
+  _release.add_config('parrot_ivb-release',
+    boards=['parrot_ivb'],
+  )
 )
 
 _release.add_config('peppy-release',