LU-7531 osp: allow few requests during recovery

LU-7531 osp: allow few requests during recovery

Allow OSP requests during recovery, so recovery
threads will not be blocked if the remote target
is also in recovery status, otherwise it might
cause deadlock.

Add replay-single.sh 117 to verify this case.

Signed-off-by: Di Wang <di.wang@intel.com>
Change-Id: Iad3b6fd382d76c9bc042096c51cfac0a0d33091d
Reviewed-on: http://review.whamcloud.com/17539
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>