Do incremental backoff if there are no jobs on the queue

Since the worker polls a queue for jobs, it can get into a busy poll. This was
the reason that there was a delay of 0.1 seconds between each poll instance.

This commit takes this a little further by doing an incremental backoff, where
it waits longer and longer after each poll where it does not find a job
available, up to an arbitrary maximum.

0 files changed, 0 insertions, 0 deletions