LU-530 group quotas not enforced

LU-530 group quotas not enforced

In filter_quota_getflag(), we shouldn't break the loop when the file's owner
doesn't have quota limit, otherwise, the check for file's group will be skipped
and the out of quota flag will not be returned to client at the end.

Signed-off-by: Niu Yawei <niu@whamcloud.com>
Change-Id: I3e92ba4c061409d5a911d46916535c71f7843e0b
Reviewed-on: http://review.whamcloud.com/1156
Tested-by: Hudson
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>