Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Revert "Do not reload config when queue is not ready"
  Do not reload config when queue is not ready
  Revert "Remove replication event from pending when runway is allowed"
  ReplicationFileBasedConfig: Fix setting default sshConnectionTimeout
  SshHelper: Add class javadoc
  Make more classes and fields public to ease extensibility
  Allow to configure timeout for SSH connection and commands
  StartCommand:  Fix synchronization on non-final field
  Destination: Suppress FutureReturnValueIgnored warning

Change-Id: I101dbbcfc3f049ebf275f4bff6c4a99e53771416