rbd admin: add a test to cover the Status function
rbd admin: add a test to cover the Status function

This is a complex test as it requires the pool and an image before it
will return any (non empty) data.

Signed-off-by: John Mulligan <eda8ad33169deab44f9fe65847f99e368da6c91b@redhat.com>

ceph/go-ceph,ceph/go-ceph,ceph/go-ceph