LU-11530 lnet: properly error check sensitivity

LU-11530 lnet: properly error check sensitivity

Reject setting health sensitivity greater than the maximum health
value.

Test-Parameters: trivial
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: I866ff2cac2ba6b034cdbac24096e7014c66a3e2e
Reviewed-on: https://review.whamcloud.com/33392
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>