gluster: add Host UUID to volume status

Added host_uuid to service details of volume status.
This can used to easily map the service details output
with host details availble in engine, instead of
comparing the ipaddress/hostname.

Change-Id: I9cda0b69e3067d71d7c0fb8d71211a47691a68f5
Bug-Url: https://bugzilla.redhat.com/885592
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>