a trivial part of orion changes:
- introduce mgs_device (old mgs_obd)
- pass lu_env around
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I53d55c9f0a91c16c9eb65ab41d9660c3699bac45
Reviewed-on: http://review.whamcloud.com/3668
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>