Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Clarify the limitations of gerrit+ssh in replication.config
  PushOne: Don't log refs to push at ERROR level
  PushOne: Remove redundant 'throws' declarations
  Destination: Further improve the debug logs when not pushing
  Improve logging of why a project or ref is not replicated
  ReplicationQueue: Add handling of null ReplicationTasksStorage.ReplicateRefUpdate
  Destination: Extract repeated string to a constant
  ReplicationQueue: Migrate to Flogger

Change-Id: Ib78ceca4d6f40f31bb80fca188228ae6aa263c23
tree: 3c0e10e71a37a8e7f0cf9cfe771d7455bd5cdf8f
  1. .gitignore
  2. .mailmap
  3. .settings/
  4. BUILD
  6. src/