A simple template to test SoftwareComponent

This patch adds a basic template to test the new
OS::Heat::SoftwareComponent resource. It can be used, for example,
for development of required changes in in-instance tools.

OS::Heat::SoftwareComponent has been added during Juno development,
so this template will not work on earlier versions of Heat.

Change-Id: I3b7f257804f47fc032f9ec658ba9dee76abcc40e
Merge "A simple template to test SoftwareComponent"