LU-1842 quota: add per-filesystem information

LU-1842 quota: add per-filesystem information

Add a global list to track per-filesystem quota information which
will be used by slaves to determine whether quota enforcement is
enabled.
This patch also enables test 22 in sanity-quota.sh which should now
pass and avoids spurious test failures due to sync_all_data.

Signed-off-by: Johann Lombardi <johann.lombardi@intel.com>
Change-Id: I336e7704d3e16dc3f5a92350c652cd6f2f25f25a
Reviewed-on: http://review.whamcloud.com/4156
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Tested-by: Hudson
Reviewed-by: Mike Pershin <tappro@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>