LU-6971 cleanup: not support remote client anymore

LU-6971 cleanup: not support remote client anymore

There are several obsolete sub commands for lfs to work with
remote client. We do not support that anymore, and should be
deleted along with any kernel code related to remote client.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I06f4348b2b3def5ac4aa75676b1b5b7ccc4ab10e
Reviewed-on: http://review.whamcloud.com/19789
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>