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_admin.py

@@ -1,18 +1,17 @@
-import os
 import json
-import pytest
+import os
 import urllib
 
-from django.test import Client, TestCase, RequestFactory
+import pytest
 from django.contrib.auth.models import Group
-from django.urls import reverse, resolve
-from django.core.management import call_command
 from django.contrib.messages import get_messages
+from django.core.management import call_command
+from django.test import Client, RequestFactory, TestCase
+from django.urls import resolve, reverse
+from django_grainy.models import GroupPermission, UserPermission
 
-from django_grainy.models import UserPermission, GroupPermission
-
-import peeringdb_server.models as models
 import peeringdb_server.admin as admin
+import peeringdb_server.models as models
 
 
 class AdminTests(TestCase):