Move config to /etc/netbox/config (Fixes #54)

With this the configuration is moved to /etc/netbox/config and the
default reports directory is set to /etc/netbox/reports. This enables
the user to mount reports from a config map or persistent volume in
OpenShift.

docker-compose.test.yml

@@ -10,7 +10,7 @@ services:
       - postgres
       env_file: netbox.env
       volumes:
-      - ./configuration:/etc/netbox:ro
+      - ./configuration:/etc/netbox/config:ro
       command:
       - ./manage.py
       - test