Add support for a resource level external_id

This adds support for the following to the template:
 heat_template_version: 2016-10-14
 resources:
   ...
   res_a:
     type: OS::Nova::Server
     external_id: the-new-server-id
     properties:
     ...

Co-Authored-By: Rico Lin <rico.l@inwinstack.com>

blueprint external-resources
Change-Id: I8fda1380504d1d8b1e96649bf20b86d6309fdeca
1 file changed
tree: dcfa3f58ee414579bf37d51dd01c1ceadf37e6e3
  1. common/
  2. functional/
  3. scenario/