Zuul may not always have the commits needed for some jobs,
and its branches may be in an unpredictable state, so only use
zuul to fetch zuul refs.
Re-set the origin to gerrit for any existing repos.
Change-Id: Ia300922d2e1585dd8d73a2711a7a25f4f9edd0e1
Reviewed-on: https://review.openstack.org/18492
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
3ed03bbecb
