Make Keel executable from a package

User story: I am an LDH operator. I want install Keel as a package, and execute all endpoints, so I can integrate it with my system (Nginx etc).

Suggested solution: Update Keel's Python packaging to expose all executable endpoints. Similarly for the debified version.

Success:

All the endpoints listed in https://source.puri.sm/liberty/ldh_middleware/blob/master/SETUP.md are executable:

1. ./manage.py collectstatic

2. ./manage.py migrate

3. ./manage.py createsuperuser

The Celery endpoint referenced in https://source.puri.sm/liberty/ldh_middleware/blob/master/conf/supervisord/purist_middleware_monitor.conf is accessible to Supervisor:

4. /opt/purist/middleware_virtualenv/bin/celery worker -B --app middleware --scheduler django_celery_beat.schedulers:DatabaseScheduler

The UWSGI module referenced in https://source.puri.sm/liberty/ldh_middleware/blob/master/conf/uwsgi_emperor_vassals/purist_middleware.ini is accessible to UWSGI Emperor:

virtualenv = /opt/purist/middleware_virtualenv
env = DJANGO_SETTINGS_MODULE=middleware.settings
module = middleware.wsgi:application

The UWSGI socket created above and referenced in https://source.puri.sm/liberty/ldh_middleware/blob/master/conf/nginx/purist_middleware is accessible to Nginx:

6. unix:/var/opt/purist/middleware/uwsgi.sock; (this may be trivial once 5 is solved)

7. I can install the ldh_middleware Python package with pip and follow the instructions in https://source.puri.sm/liberty/ldh_middleware/blob/master/SETUP.md (adjusting for installation locations) to get a working site.

8. I can install the ldh_middleware deb file with gdebi and follow the instructions in https://source.puri.sm/liberty/ldh_middleware/blob/master/SETUP.md (adjusting for installation locations) to get a working site.

Notes:

• Defining and installing non-Python dependencies is not required. Automating the installation steps is not required.