LU-2110 mount: do not start osp twice

LU-2110 mount: do not start osp twice

failover nid can be added under the same marker as the
main device setup block. so do not call lustre_osp_setup()
on a subsequent LCFG_ADD_UUID command in the config.

Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Change-Id: Ic4858812e942f73dd264dca5e33b27d51509f670
Reviewed-on: http://review.whamcloud.com/4227
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>