add renumbering procedure for openstack VMs

    we could also have used existing flavor size if we needed a larger

    disk

 7. click "Next" to go to the "Networks" tab

 8. click on the arrow on the "iaas.torproject.org" line

 8. click on the arrow on the `sunet.se-public` line

 9. go to the "Security groups" tab and pick "anything"

 10. add the anarcat keypair, create a new one for you if missing, but

     add it too

        openstack server add floating ip build-arm-10.torproject.org 213.146.141.28

## Renumbering a server

To renumber a server in Openstack, you need to first create a port,

associate it with the server, remove the old port, and renumber IP

elsewhere.

Those steps were followed for `ns5`:

 0. Make sure you have access to the server through the web console first.

 1. add the new port:

        openstack port create --network sunet.se-public ns5.torproject.org

 2. assign it in the right security group:

        openstack port set --security-group anything ns5.torproject.org

 3. attach the port to the instance:

        openstack server add port ns5.torproject.org ns5.torproject.org

 4. remove the old port from the instance:

        openstack server remove port ns5.torproject.org dcae4137-03cd-47ae-9b58-de49fb8eecea

 5. in the console, change the IP in `/etc/network/interfaces`...

 6. up the new interface:

        ifup -a

 7. renumber the instance, see the `ganeti.renumber-instance` fabric

    job for tips, typically it involves grepping around in all git

    repositories and changing LDAP

# References

 * [How to launch an instance](https://docs.openstack.org/install-guide/launch-instance.html)