Reduce repeated key-value pairs

Reduce repeated key-value pairs

- Move common pairs like project, project-name to local
  common macros
- Add values to defaults.yaml like container-push-registry
  to avoid repetition in project templates
- Drop unused docker templates; the base image was
  renamed to bldr-alpine3

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: Ia212df85acf4bbb5264e22ab9606a9125e47dc2d