LU-1842 quota: new quota RPC format

LU-1842 quota: new quota RPC format

Define RPC formats for quota acquire/release:
- non-intent DQACQ;
- intent DQACQ (per-ID intent lock);
- intent CONNECT (global intent lock);

Signed-off-by: Niu Yawei <niu@whamcloud.com>
Change-Id: Ia6ec34326cd94274f2f0f42b89f11e52d0dc8317
Reviewed-on: http://review.whamcloud.com/3977
Tested-by: Hudson
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>