A common tool to generate sample Heat environment files would be beneficial
in two main ways:
* Consistent formatting and details. Every environment file would include
parameter descriptions, types, defaults, etc.
* Ease of updating. The parameters can be dynamically read from the templates
which allows the sample environments to be updated automatically when
parameters are added or changed.
Change-Id: I9104f1abe2a5f0aaf68d927c8716bee4bc85a41e
14dc607453