Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  ReplicationTasksStorage: Remove synchronized from list* methods
  TasksStorage: Add unit tests for reset() and resetAll()
  TasksStorage: Add canStartDifferentUris unit test
  ReplicationIT: Use streams to simplify
  ReplicationIT: Use PushOne.ALL_REFS constant
  ReplicationTasksStorageTest: Add a test for start()
  ReplicationTasksStorage: Remove test-only list* methods
  Fix synopsis in replication start cmd documentation
  TaskStorage: Fix assertContainsExactly
  TaskStorage: Rename unit tests with 'persist' in their names
  Don't wait for pending events to process on startup
  ReplicateRefUpdate: Drop awkward constructor
  TasksStorage: Replace delete() with start()+finish() in tests
  ReplicationTasksStorage.Task: Add unit tests
  ReplicationTasksStorage: Add unit tests

Change-Id: I3f9ec778fdfa2e8565e0a5fb0f85c67a0420e131