gluster: Included additional fields in rebalance status

Included the adiitional fields runtime, filesSkipped and houstUuid in
gluster rebalance status entity class.

Change-Id: I71a20fbb93a9731ca2ff68ddd401589d319226d4
Bug-Url: https://bugzilla.redhat.com/1011883
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>