Expose authentication setup

[jeremyeder]

Hard-coded to htpasswd here:

https://github.com/redhat-openstack/openshift-on-openstack/blob/master/templates/var/lib/ansible/group_vars/OSv3.yml#L43

Worth exposing?

[ioggstream]

Seeing https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=1383010

I'm removing ldap authentication parameters and replacing them with a switch to disable htpasswd.

Another solution could be merge the various authentication setups via merge_dict