Fix python3 compatibility of rbd get_fsid
Fix python3 compatibility of rbd get_fsid

In python3 librados's get_fsid() function is represented as binary.
Because of this, conditional where fsid is compared with fsid parsed
from glance's direct url is not true, then cinder-glance
acceleration is not working. This patch is fixing this.
More informations are in closing bug.

Closes-Bug: #1816468

Change-Id: I69d0685ec845355329f771f27f8894d9e988ae35

mahak/cinder,mahak/cinder,openstack/cinder,openstack/cinder