Add CephX keys for Cinder and Glance if configured

This commit ensures that ceph.conf has the appropriate entries for
the CephX keys for Cinder and Glance if Key creation is enabled.
Ensure up-to-date Ceph packages are installed

Hosts with the client role will right now install the standard packages
the distribution provides; in the Debian example, that means 0.42. This
obviously does not work very well, so ensure that the same repositories
are in place that the init class uses.