LU-2170 osc: set osc_lock attribute only once

LU-2170 osc: set osc_lock attribute only once

Set osc_lock's attribute by lock allocator, otherwise if this lock is
matched and enqueued by a glimpse thread, the osc_lock's ols_glimpse
will be set to true and the lock state will be messed in
osc_lock_upcall().

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: Ib8492fa159a43dad11febe5a01f8c4ef72b8c4f3
Reviewed-on: http://review.whamcloud.com/4316
Tested-by: Hudson
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>