LU-2558 test: recovery-small 19a FAIL no eviction

LU-2558 test: recovery-small 19a FAIL no eviction

Use stat instead of mcreate since latter cannot
ensure enqueue a lock.

Signed-off-by: yang sheng <ys@whamcloud.com>
Change-Id: Ifb63f679305e707df64457c4de599ca1b5fb0f00
Reviewed-on: http://review.whamcloud.com/4987
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Hudson
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>