Revert "Reuse Gerrit code for head update" This reverts commit 1a1abe3ed37eccaf4e23df696180ff3c8e2dc923. Reason for revert: The pull-replication needs specific logic on the ACLs which would not be compatible with the existing Gerrit's heads update command. Change-Id: Icb82133909f48e3e7740ad4de7fc09a91166dbb0