LU-1187 lod: move seq client init from MDT to LOD

LU-1187 lod: move seq client init from MDT to LOD

Move seq client init from MDT to LOD, so to unify
config log for adding OSP and MD OSP.

Change-Id: I93f91c0dd6f3568196a99eecf422e0b409abda31
Signed-off-by: Wang Di <di.wang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/4337
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>