LU-1842 quota: add core QSD code

Add acquire/release logic on the qsd side as well as reintegration
which is handled in 3 steps:
- enqueue global index lock
- fetch global index and update local enforce list
- fetch slave index and update local copy
- adjust/release quota space as appropriate

This patch also fixes the ofd code to call ->ldo_recovery_complete
across the stack.

Signed-off-by: Johann Lombardi <johann.lombardi@intel.com>
Change-Id: Ib4a8910fe34de878159827c76b40a8f899aaad10
Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-on: http://review.whamcloud.com/4182
Tested-by: Hudson
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>