LU-1137 ldlm: fix for the flock handling for 1.8 clients

LU-1137 ldlm: fix for the flock handling for 1.8 clients

The current fix intended to fix the issue with incorrect flock
owner field filling. This issue observed when 1.8 clients
(and with lesser version) doesn't fill the owner field correctly.
With this patch this filling integrated on the 2.x server side.

Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andriy Skulysh <andriy_skulysh@xyratex.com>
Signed-off-by: Alexey Lyashkov <alexey_lyashkov@xyratex.com>
Signed-off-by: Iurii Golovach <iurii_golovach@xyratex.com>
Xyratex-bug-id: MRP-413
Change-Id: I88ba40eb9cb74d07b90862801669028c5dc94e08
Reviewed-on: http://review.whamcloud.com/2193
Reviewed-by: Andriy Skulysh <Andriy_Skulysh@xyratex.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>