LU-847 quota: move lmv/mdc/osc/lov quota code out of lquota

LU-847 quota: move lmv/mdc/osc/lov quota code out of lquota

All quota code was initially put into a separate kernel module since
quota might be released under a different license. That's not relevant
any more and we can now move the client-side quota code back to the
regular lustre modules.

This removes useless indirections and makes the code easier to read
and to maintain.

Change-Id: If898a46db9158edb8e4eaf855f1ed98db97330f0
Signed-off-by: Niu Yawei <niu@whamcloud.com>
Signed-off-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1613
Tested-by: Hudson
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>