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_whois.py

@@ -1,10 +1,12 @@
-from peeringdb_server.models import REFTAG_MAP
-from django.core.management import call_command
-from .util import ClientCase
-
 import io
 import sys
 
+from django.core.management import call_command
+
+from peeringdb_server.models import REFTAG_MAP
+
+from .util import ClientCase
+
 
 class TestWhois(ClientCase):
     @classmethod