Add the ability to run throughput test indefinitely
Add the ability to run throughput test indefinitely

This should only be used when oneShot = true.
Setting validationRunTime to 0 will enable the endless
run time.  Use kill -SIGTERM to the main PID, and the
results should stil be primted at the end.

bmichalo/MoonGen,bmichalo/MoonGen,bmichalo/MoonGen,bmichalo/MoonGen