koji_hub / kojira: place the queue file where everyone can see it.
    
    New versions of kojira can optionally produce a queue file.
    This shows the buildroots that it knows need regeneration and
    how long they have been known out of date. It might help users
    see where a buildroot they are waiting for is in the queue.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>