R1:2cd77b5b5817

Improve taskmaster behavior on empty queues

Summary:
Right now, taskmasters on empty queues sleep for 30 seconds. With a default setup (4 taskmasters), this averages out to 7.5 seconds between the time you do anything that queues something and the time that the taskmasters start work on it.

On instances, which currently launch a smaller number of taskmasters, this wait is even longer.

Instead, sleep for the number of seconds that there are taskmasters, with a random offset. This makes the average wait…