LU-13510 lnet: Add lnet_lnd_timeout to lnetctl

LU-13510 lnet: Add lnet_lnd_timeout to lnetctl

Add lnet_lnd_timeout to lnetctl. The param is read-only since it is
calculated from transaction_timeout and retry_count.

Test-Parameters: trivial
Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I516d2d8082951014835c9e8c8a7ac2111f48e7ce
Reviewed-on: https://review.whamcloud.com/38464
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>