Modify Gerrit patchset-created hook

Modify Gerrit patchset-created hook to use customized message.
This partially fixes the problem with Jeepyb and Gerrit.

Change-Id: Idb1232667477a1c4ba2ba58d2216e26d401f9f49
Partial-Bug: 1348934
Merge "Modify Gerrit patchset-created hook"