Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  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: I13265df47beca6717dc78a790fba793c649a8b1b
tree: e1f054c597e1dfa4f7113db97a0b318ae3c0cdb0
  1. .gitignore
  2. .mailmap
  3. .settings/
  4. BUILD
  6. src/