Initial scripts for EC2

Here are my work-in-progress but able-to-bring-up-a-cluster scripts for EC2.

I'm continuing to work on these, not least because with current EC2 networking k8s doesn't work at all.  I have a parallel PR to work on support for IPv6, which should then let this work, but I guess other people may be able to take these scripts and e.g. add support for OpenVswitch.

"up" works; nothing else does.