LU-10269 ldlm: allow trybits in waiting queue

LU-10269 ldlm: allow trybits in waiting queue

Lock trybits can be kept while lock is waiting and each new
lock filters trybits of locks in the waiting queue. When lock
if granted finally remaining trybits are added to the granted
bits. Therefore trybits can be granted for blocking lock if
no other locks take these bits while lock is waiting.

Test-Parameters: mdscount=1 mdtcount=1 testlist=racer,racer,racer,racer
Signed-off-by: Mikhal Pershin <mike.pershin@intel.com>
Change-Id: I775f776f4cf8b581e32e4a1585e862e1764b5bed
Reviewed-on: https://review.whamcloud.com/30343
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>