webadmin: show bricks status in volumes table

Replaced 'Number of Bricks' column of volumes table
with 'Bricks' column.
This column will show no.of bricks up and no.of bricks
down for the volume with up and down images.

Change-Id: Ia2bf7185fdcdc857c406cec5e7d0a1024e1ab8a3
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>