Merge branch 'stable-2.7'

* stable-2.7:
  Skip non-commits when verifying access for 'add branch' operation
  Fix gerrit-extension-api-X.Y-all-sources.jar

Conflicts:
	gerrit-extension-api/pom.xml

Change-Id: Ie0cb12e9c524bd318b602c8997103941c7a54877