webadmin : Change volume status to yellow when bricks down

Show yellow up arrow when one or more bricks of a volume are down

Signed-off-by: Anmol Babu <anbabu@redhat.com>

Change-Id: Iddaf1676bf9bf2c3aa0d4381e5057e21d4c8512e
Signed-off-by: Anmol Babu <anbabu@redhat.com>