utility script to wait for them to reboot and reach PXEWAIT. This
  indicates inner emulab is raelly ready

* When an inner experiment is defined (elabinelab_eid in experiments
  table) fire that experiment off by doing an ssh into inner boss. I
  am currently doing this with -w (wait mode) but eventually will need
  to do it async for experiments in which the control net is turned
  off. Also, not actually swapping experiment in yet since multicast
  and frisbee are still broken inside.

* Add -k mode for cleaning up. The intent of this is to avoid power
  cycling all the nodes cause outer elab cannot reboot or ipod them.
  Goes like this:

  * Clear the inner_elab_role for experiment's nodes from the reserved
    table.

  * Clear def_boot_osid,next_boot_osid,temp_boot_osid for nodes. This
    is bogus cause os_select whines about doing this, but the point is
    to make sure that all nodes will go into PXEWAIT when they reboot.
    We could have them go into MFS, but thats bound to cause problems
    if inner elab has a lot of nodes (remember, cannot trust what is
    on disk). This needs more thought.

  * Regen and restart outer dhcpd. Nodes will become part of outer
    emulab on next boot cycle.

  * SSH into inner boss and kill inner DHCPD so that there will not be
    any DHCPD responses on inner control network.

  * SSH into inner boss and have it reboot all inner nodes.

  * Wait for node to reach PXEWAIT.

  The above needs more thought wrt firewalled experiments and isolated
  control network.

* Kill off some old MFS copy code since we now get those direct from
  website.