LU-2613 recovery: free open/close request promptly

- For the non-create open or committed open, the open request
  should be freed along with the close request as soon as the
  close done, despite that the transno of open/close is
  greater than the last committed transno known by client or not.

- Move the committed open request into another dedicated list,
  that will avoid scanning a huge replay list on receiving each
  reply (when there are many open files).

Lustre-commit: 4322e0f99c87bc0412d315d0674d70cc1ffc0bb4
Lustre-change: http://review.whamcloud.com/6665

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: Hongchao Zhang <hongchao.zhang@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Change-Id: I584a5530c1a466a42e0b2dd54df59e83e0eaa174