Hook into environment merging on server

If environment_files is specified, look in the files dict for each
specified environment file and merge into the stack's environment. This
is the same workflow that previously occurred client-side.

Change-Id: Ibe46fd35de7988920c101a83259c06c8f8a3ed0b
Implements: blueprint multi-environments
2 files changed
tree: b45a78ef25db7b5e9c2e60d9618d579702c6bbfc
  1. common/
  2. functional/
  3. scenario/