Eucalyptus support

[jhohertz]

It is intended to support Eucalyptus fully, but has not yet been tested and accounted for fully re: setting base EC2 API URL and so on. Their version 3.3 was tested for several Netflix components, and support is a stated design goal, and even a frame of reference for being "complete".

More on Eucalyptus here: https://www.eucalyptus.com/eucalyptus-cloud/tools

There are actually official playbooks existing for Eucalyptus here: https://github.com/eucalyptus/playbook as well as some supplementary roles here: https://github.com/eucalyptus/ansible-playbooks