LU-12452 lnet: allow to set IP ToS value per-NI

LU-12452 lnet: allow to set IP ToS value per-NI

This patch allows to set the IP "Type of Service" value per network
interface to use IP QoS on TCP or RoCE network.

e.g:
	$ lnetctl add --net tcp2 --if eth1 --tos 104

Test-Parameters: trivial testlist=sanity-lnet
Signed-off-by: Etienne AUJAMES <eaujames@ddn.com>
Change-Id: I99fad41f4b12951c0d09ad7460ff0ed107e7ce0a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54081
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>