LU-11300 lnet: consider alive_router_check_interval

LU-11300 lnet: consider alive_router_check_interval

Consider router_check_interval when waking up the monitor thread,
to make sure you wakeup the monitor thread at the earliest possible
time.

Test-Parameters: forbuildonly
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: Ibc4b53886b59a9bc174a29d0da711ac77db3a62c
Reviewed-on: https://review.whamcloud.com/33298
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Tested-by: Jenkins