LU-350 fix bug in mgs to allow starting OST before MDT

LU-350 fix bug in mgs to allow starting OST before MDT

in mgs_steal_llog_for_mdt_from_client, it forgets to add the "index" and
"svname" of the existing OST to the config log of the MDT's lov, then cause
Lustre fails to mount if the OSTs start before MDT.

Change-Id: I0e68bf51c88517dbd42790e7e4447a186cf268f3
Signed-off-by: Hongchao Zhang <hongchao.zhang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/595
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>