LU-7205 osp: prohibit multi inflight RPCs for same object

LU-7205 osp: prohibit multi inflight RPCs for same object

We should prohibit multi inflight sync RPCs for the same object,
otherwise, the object could be set with stale ownership if the
RPCs arrives OST in reverse order.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: I8835e493fa04fbc224b2f9840f0bb7b250d5de1d
Reviewed-on: http://review.whamcloud.com/16651
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>