Use python rados client to talk to the ceph-mgr service.
A python rados client is created by the driver that lasts
during the driver's lifecycle.
The drivers can now work with multiple filesystem clusters.
The filesystem to be used by manila can be specified by the
driver option 'cephfs_filesystem_name'.
The removal of a share will be quicker for the manila user.
The ceph-mgr volumes module moves the share's content to
a trash folder and purges the trash's contents
(`rm -rf` of the backend CephFS subvolume/subtree) aysnchronously,
whereas the ceph_volume_client library moves the share's content
and purges the content synchronously.
Implements: bp update-cephfs-drivers
Co-Authored-By: Victoria Martinez de la Cruz <victoria@redhat.com>
Co-Authored-By: Ramana Raja <rraja@redhat.com>
Co-Authored-By: Tom Barron <tpb@dyncloud.net>
DocImpact
Change-Id: I1f81db1ba7724c0784d87f9cb92bb696f6778806
a830710939