gluster: Override CommandBase.getJobMessageProperties

The patch overrides the basic implementation of getJobMessageProperties
with a concrete one relevant to Gluster commands:
1. Commands inherited from GlusterCommandBase define the Cluster name.
2. Commands inherited from GlusterVolumeCommandBase define Volume name
as well as Cluster name.

Change-Id: I393621e3f52b343b8dc5916f20497a0da3aa3bf1
Signed-off-by: Moti Asayag <masayag@redhat.com>