LU-10003 lnet: deprecate lctl net commands

LU-10003 lnet: deprecate lctl net commands

Added a deprecated message for commands which are implemented in
lnetctl. The lctl commands will continue to function.

Signed-off-by: Amir Shehata <amir.shehata@intel.com>
Change-Id: I3f528d0145f7958106a2fc6842fcd1670c9b9d7c
Reviewed-on: https://review.whamcloud.com/30755
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>