LU-4597 clio: clear nowait flag agl lock re-enqueue

LU-4597 clio: clear nowait flag agl lock re-enqueue

The LDLM_FL_BLOCK_NOWAIT flag should be cleared when re-enqueue
the agl lock as normal glimpse, otherwise, it won't get size back
if there is conflicting locks on other client.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: Ifd311606e824d6574bfbf3256841061e8867214a
Reviewed-on: http://review.whamcloud.com/9249
Tested-by: Jenkins
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Ned Bass <bass6@llnl.gov>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>