controller_common: fixed rabbitmq provider parameters handling for glanc...

On the latest installation tests, glance cannot connect to rabbitmq because of missing credentials. I believe file
puppet/modules/quickstack/manifests/controller_common.pp is missing this part that handles rabbit credentials for rabbitmq provider.

File puppet/modules/quickstack/manifests/glance.pp does a similar thing, but without passing the correct parameters, the class glance::notify::rabbitmq is only using default blank credentials.
I think this patch should work, but I just wanted to notify this at the moment, test of this patch is in progress, so don't merge it yet.

 thanks