LU-13569 lnet: Age peer NI out of recovery

LU-13569 lnet: Age peer NI out of recovery

No longer send recovery pings to a peer NI that has been in recovery
for the recovery time limit. A peer NI will become eligible for
recovery again once we receive a message from it.

The existing lpni_last_alive field is utilized for this new purpose.

A check for NULL lpni is removed from
lnet_handle_remote_failure_locked() because all callers of that
function already ensure the lpni is non-NULL.

lnet_peer_ni_add_to_recoveryq_locked() now takes the recovery queue
as an argument rather than using the_lnet.ln_mt_peerNIRecovq. This
allows the function to be used by lnet_recover_peer_nis().
lnet_peer_ni_add_to_recoveryq_locked() is also modified to take a ref
on the peer NI if it is added to the recovery queue. Previously, it
was the responsibility of callers to take this ref.

Test-Parameters: trivial
HPE-bug-id: LUS-9109
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: Ib4676540ac4bb040690a4fb047236c54eea0e752
Reviewed-on: https://review.whamcloud.com/39718
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>