Previously the glance ceph backend was only being configured during
the deploy and reconfigure commands. This change ensures that it is
configured during the upgrade and genconfig commands as well.
Some of the related host/group selection logic has been cleaned up,
as it was a little tautolgous.
Change-Id: Ibfc2bfaaf2e24fb3a0697925e7723794046787fa
Closes-Bug: #1728060
Most simple implementation of external ceph support.
We use INI merge to configure RBD backend for Glance and copy
ceph.conf and keyring provided by the user into the container.
Set_configs.py had to be extended to support globbing (wildcards) in
order to copy ceph keyring file which is named depending on the cephx
user name.
Partially-Implements Blueprint: external-ceph
Partially-Implements Blueprint: selectable-ceph
Change-Id: Iacadbd8ec9956e9f075206ea03b28f044cb6ffb8