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
f16a45180c