LU-9120 lnet: set health value from user space

LU-9120 lnet: set health value from user space

Add commands to lnetctl to set the health value.

for local NIs:
 lnetctl net set --nid <nid> --health <value>

for peer NIs:
 lnetctl peer set --nid <nid> --health <value>

Test-Parameters: forbuildonly
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: I06e1238df54c94bcfecadd84fbaa30cc1ce4dd68
Reviewed-on: https://review.whamcloud.com/32863
Tested-by: Jenkins
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>