GFS2: quotas not being refreshed in gfs2_adjust_quota

Old values of user quota limits were being used and
could allow users to exceed their allotted quotas.
This patch refreshes the limits to the latest values
so that quotas are enforced correctly.

Resolves: rhbz#1077463
Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>