Deliver HOT hello world template

This patch delivers a most simple HOT template with only a single instance,
no software, and just a few basic parameters and output.
The template can be processed with the code delivered in this patch

https://review.openstack.org/#/c/33258/

applied to the heat repository.

Contributes to blueprint hot-hello-world

Change-Id: Ib87a88aa4a71f1c1f147084273610b95bda704c1