Merge branch 'stable-3.12'

* stable-3.12:
  Make excludedRefsPattern() to return an empty list by default
  Do not push deletes for refs configured to be skipped
  Add a remote config to exclude replicating desired refs
  Auto-format source code using gjf

Change-Id: I57e2f34aa6b3012d2aaca69ac13899ab2bc392c2