webadmin : Edit Role Dialog Reads "Volumes" instead of "Gluster"

Edit Role Dialog Reads "Volumes" instead of "Gluster"

Change-Id: I94e8df6c90025cfaa16f30b04a53698a9aa258fc
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1029648
Signed-off-by: Anmol Babu <anbabu@redhat.com>