LU-9121 lnet: Add a selection policy

LU-9121 lnet: Add a selection policy

This patch adds the function lustre_lnet_add_udsp()
which marshals the input rules and makes an ioctl
call to add those rules in the lnet structures.

Change-Id: I5fa1e34d401b9eca58381e23cac2eb49c4dd3575
Test-Parameters: trivial testlist=lnet-selftest,sanity-lnet
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Signed-off-by: Sonia Sharma <sharmaso@whamcloud.com>
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34529
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>