cloudinit documentation regarding jinja2 templating is incomplete

In the documentation and examples provided under the cloudinit porition of the plugin there are no examples or explanation of jinja2 templating.  The documentation is also poor on Cloudify's website.

I would reccomend using some of the examples and documentation from this repository:

https://github.com/jrzeszutek/cloudify-utilities-plugin/tree/master/cloudify_cloudinit