wubloader/downloader
Mike Lang 72003f28d0 downloader: Don't check the age of a worker we just spawned
Not only is this redundant, but it creates a race condition where
the worker fails before the latest_worker = workers[-1] check,
and we get an IndexError.
..
downloader downloader: Don't check the age of a worker we just spawned
Dockerfile Refactor dockerfiles for more shared layers
setup.py downloader: Track timestamp of latest segment