LU-11300 lnet: peer aliveness

LU-11300 lnet: peer aliveness

Peer NI aliveness is now solely dependent on the health
infrastructure. With the addition of router_sensitivity_percentage,
peer NI is considered dead if its health drops below the percentage
specified of the total health. Setting the percentage to 100% means
that a peer_ni is considered dead if it's interface is less than
fully healthy.

Removed obsolete code that queries the peer NI every second since
the health infrastructure introduces the recovery mechanism which
is designed to recover the health of peer NIs.

Test-Parameters: forbuildonly
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: I506060fbb66c74295808891b689d7d634dc69284
Reviewed-on: https://review.whamcloud.com/33186
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Tested-by: Jenkins