Avoid checking if "services" tenant is accessible

It appears that checking whether the "services" tenant is accessible in
Openstack causes a barrage of "401 Unauthorized" errors in the logs.  Based on
how we handle it in the OpenstackHandle, it does not appear to be a fatal error.

However, cleaning up this error will make diagnosing problems via the logs much
easier.

https://bugzilla.redhat.com/show_bug.cgi?id=1140174
Merge pull request #1053 from blomquisg/bz1140174-rhos-401-errors

Avoid checking if "services" tenant is accessible