openqa playbook: rearrange, drop queue 'when' conditionals
    
    This was kinda...a mess. I had just dumped the queue creation
    in the staging NFS client play for some reason, and it still
    had 'when' conditionals from when I only wanted the messaging
    stuff to happen on staging. This cleans all that up and creates
    separate plays for the queue creation and NFS client stuff.
    The plays should also be in the right *order* now, so we get
    the NFS mounts created and the AMQP queues set up *before* we
    run the roles.