Test that Zuul refs end up in the correct repos.

Change-Id: I5a0040e6cf1076dfb21e355b7c021fdfc1914ca5
Reviewed-on: https://review.openstack.org/22738
Reviewed-by: Anita Kuno <akuno@lavabit.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
Correct two links.

The github project has changed from `openstack-ci` to `openstack-infra`,
but two links in the documentation do not reflect this change.

Change-Id: I9359d1071f33719da39fdefd14deea728b9dbfff
Reviewed-on: https://review.openstack.org/23033
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins