LU-1842 quota: remove quota code from lvfs

This patch removes the quota code from the lvfs directory.
Most of this code has already been moved to ldiskfs OSD.
This patch also removes the dt_init_quota_ctxt which isn't
used any more.

Signed-off-by: Johann Lombardi <johann@whamcloud.com>
Change-Id: I6ab6a26ae877d5c0bebab674204f7d36f9d83078
Reviewed-on: http://review.whamcloud.com/4110
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>