LU-12344 lnet: handle remote health error

LU-12344 lnet: handle remote health error

When a peer is dead set the health status to REMOTE_DROPPED
in order to handle health properly for the peer.
When dropping a routed message set REMOTE_ERROR. Routed messages
are dropped when the routing feature is turned off which could
be considered a configuration error if it happens in the middle
of traffic. Therefore, it's better to flag this issue at this
point without resending the message.

Lustre-change: https://review.whamcloud.com/34967
Lustre-commit: b45e3d96fc4d82ebf5b1bb3ef0b5a59e8ff86e75

Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: I131263215a68fc8607582643a47007ce4d04abbc
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>