Reviewed by Adam Barth.

        EWS Queues should remove orpahned pyc files before starting
        https://bugs.webkit.org/show_bug.cgi?id=50904

        A previous check added a platform.py which caused
        EWS bots on some platforms to hit an import exception.
        The platform.py file was removed in a subsequent commit, but
        the EWS bots in question stayed stuck.  This change will
        fix those bots once restarted (and prevent this in the future).

        I also went ahead and unified start-queue and start-commit-queue
        since they were nearly identical.  I also added bot_id support
        to both force all EWSes to have bot ids as well as get rid of the one
        remaining reason why I had my own copies of these scripts.
        Hopefully this will be enough to get all the other bot admins
        (ahem, Adam, ahem) to move to using these checked in copies as well.

        * EWSTools/start-commit-queue.sh: Removed.
        * EWSTools/start-queue.sh:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73895 268f45cc-cd09-0410-ab3c-d52691b4dbfc