Enhance buildfile and Docker templates:

  - [x] Move config file add to build.json (more intuitive). Then use that as
        basis for required dirs.
        - [x] Move DockerAdd
        - [x] Move WorkingDir
        - [x] Prescriptive defaults
        - [x] Tie into requiredfiles (simple, complex tbd)
  - [x] Dockerfile needs galaxy role lookup added to template. => add requires
        to buildfile.