pdc: fare thee well!
    
    This commit retires pdc from ansible.
    The website should get redirected to a wiki page about the retirement.
    If for some reason we need to bring things back, the vm's will still
    have their disks and xml saved off so we can bring it back.
    Would need to revert this, run proxy playbooks and do a little cleanup
    on the redirect, then bring the vm's back up.
    Hopefully we don't have to.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>