Fix nginx reload file descriptor tests in lua branch.
Fix nginx reload file descriptor tests in lua branch.

Since we shared.runServer likely reloads the nginx server prior to
running, we now need to warm up the processes, so we don't experience
unexpected descriptor growth later on in the tests.

Also extend the timeout between lsof calls after nginx reloads. Since
we're doing more background processing in nginx now, it may sometimes
take longer for the old worker processes to totally disappear.

apinf/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella