Let the plugin setup and configure CephFS as the storage backend for
Manila. This is not done by default. Refer the README to do so.
The following tweaks had to be made:
* Install a development version of Ceph that is compatible with Manila's
CephFSNative driver.
* The development version is a version greater than Infernalis. And
from Infernalis onwards, the ceph daemons are run as user "ceph".
So allow the daemons to run as user "ceph" for such versions.
* Enhance get_ceph_version to check Ceph version even when the
ceph mon daemon is not up, by instead checking for the CLI version.
Change-Id: I74314bfcc6b52d524bb84f2232a988f275b9afbf
Co-Authored-By: John Spray <john.spray@redhat.com>
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