LU-2797 osc: GPF in osc_send_oap_rpc

LU-2797 osc: GPF in osc_send_oap_rpc

Due to cl_loi_list_lock release in osc_send_oap_rpc(), this
leaves a window where lov_oinfo may be freed/poisoned between both
write/read steps/calls of osc_send_oap_rpc() in osc_check_rpcs(),
thus it needs to be refreshed.

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: Id3056c1fca91bade65b6d2b556b6b47a3d3d089e
Reviewed-on: http://review.whamcloud.com/6089
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>