glusterd: Allowing root@hostname::slave georep sessions to be created.

non-root@hostname::slave-vol geo-rep sessions are not supported.
only hostname and root@hostname sessions are supported, and are
treated as the same.

Change-Id: I87551e1bd4ff4e0e6520c34eb3d944587cc65476
BUG: 998933
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/5659
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>