Rename DB_HOST to database_hostname
Remove DB_HOST setting from webapp-django
Remove PATH setting from webapp-django tests
Remove DB_USER from webapp-django jenkins tests
Replace ES_HOST envvar with elasticsearch_urls
Replace DB_USER envvar with database_username
Replace DB_PASSWORD envvar database_password.
Replace RABBITMQ_HOST envvar with rmq_host.
Replace RABBITMQ_USERNAME envvar with rmq_user
Replace RABBITMQ_PASSWORD with rmq_password.
Replace RABBITMQ_VHOST envvar with rmq_virtual_host