Change code source repo to review.openstack.org

There is some chance that gerrit refs synchronization to git mirrors
is delayed so much that a gerrit triggered jenkins job fails to get
the latest refs code to test, so the repo is changed to gerrit directly.

Change-Id: Idbb3fbe39b72441efc636feecf00d27eab7913b1
Merge "Change code source repo to review.openstack.org"