LU-447 add lctl --net XXX push

LU-447 add lctl --net XXX push

In order to clear out peer/conn data in the gnilnd for testing after
adding lnet_notify(see LU-446), we need an alternative to
lctl --net gni del_peer - as this nukes the peer and results in false
lnd_query failures.

Change-Id: Ie8029953a2881c0d6e3ac250101d2d4374bbf3c1
Signed-off-by: Wally Wang <wang@cray.com>
Reviewed-on: http://review.whamcloud.com/1311
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Lai Siyao <laisiyao@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>