* Allow for customizing the receptor image
* Hook in receptor image to docker-compose template
* Fix missing -e to pass into Dockerfile playbook
* Add some docs
- removes local_docker installer and points community users to our development environment (make docker-compose)
- provides a migration path from Local Docker Compose installations --> the dev environment
- the dev env can now be configured to use an external database
- consolidated the Local Docker and dev env docker-compose.yml files into one template file, used by the dockerfile role
- added a 'sources' role to template out config files
- the postgres data dir is no longer a bind-mount, it is a docker volume
- the redis socket is not longer a bind-mount, it is a docker volume
- the local_settings.py.docker-compose file no longer needs to be copied over in the dev env
- Create tmp rsyslog.conf in rsyslog volume to avoid cross-linking. Previously, the tmp code-generated rsyslog.conf was being written to /tmp (by default). As a result, we were attempting to shutil.move() across volumes.
- move k8s image build and push roles under tools/ansible
- See tools/docker-compose/README.md for usage of these changes
