Merge branch 'stable-3.4'

* stable-3.4:
  Fix the default logic in managing refs-filter
  Reuse Gerrit code for head update
  Add HEAD update REST API endpoint
  Add project initialisation during fetch REST Api call
  Add project delete REST API endpoint

Change-Id: I006a7b86b05ac14b87efa6c38c3c4d2fe7e25b12