Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  Block Fetch Rest API call when instanceLabel is missing
  Execute refs fetch in batches
  Add native git fetch support
  Make sure replication task clean up is triggered
  Fix issue with replication when replicationDelay is set to zero

Change-Id: I7cf52860e28c251bf7d7c36ef9e125305ccdfbf5
tree: d4a7bb0172399c4b090b5bbf0b5048382d71d586
  1. BUILD
  2. Jenkinsfile
  4. src/