LU-3536 osp: move update packing into out_lib.c

Move osp_update_insert to out_lib.c, so OSP/LOD/OUT
can all pack update into OUT RPC.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: If087a0bc6a858e9e6c128311ed0d80e4392ffaff
Reviewed-on: http://review.whamcloud.com/9321
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>