clean up / format / poetry (#1000)

* stub in poetry for pipenv

* re-add tester image

* add pre-commit / formatting

* fix ghactions

* revert test data whitespace, exclude tests/data

* revert ws

* decruft, rm tox/pipenv

* install dev packages for base image

* add lgtm config to force to py3

tests/test_autocomplete.py

@@ -1,12 +1,12 @@
 import json
 
-from django.urls import reverse
-from django.test import Client, RequestFactory
-
 import reversion
+from django.test import Client, RequestFactory
+from django.urls import reverse
 
-from peeringdb_server.models import User, Organization, Network
 from peeringdb_server import autocomplete_views
+from peeringdb_server.models import Network, Organization, User
+
 from .util import ClientCase