LU-16548 lnet: report actual timeout used by lnd

LU-16548 lnet: report actual timeout used by lnd

lnd_timeout value reported by lnetctl may be different
from what is actually used.
There's an lnd_timeout calculated as a function of transaction
timeout and retry_count. This is the value displayed by
"lnetctl global show". However, each LND may define its own
timeout by setting timeout module parameter to a positive value,
which overrides the higher-level lnd_timeout defined by LNet.
lnetctl net show -v will show the timeout value in the
lnd_tunables section.
The timeout for socklnd, o2iblnd and gnilnd is implemented.
A test for sock, ib and gni is included.

Test-Parameters: trivial
Signed-off-by: Frank Sehr <fsehr@whamcloud.com>
Change-Id: I85a107ba6f1259c577f74945b89fd695f191d514
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50620
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>