acquire: Automatically reduce select() timeout as needed

If there is an item with fetchAfter at the top of a queue,
reduce sleep() timeout so we can detect it and start it,
by calling Cycle() on the queue in the next iteration.

For some reasons we have to call select() with a 0s timeout
if we just marked an item as ready. Oh well.

Previous versions of this patch only called global Bump() after a timeout
from select(); this was unfortunately incorrect - it meant that we
never bumped a queue that did not start yet while other queues were
running, potentially significantly delaying retries.

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