Add some OIDC flow tests.

Enable testing for gregui, add a django config for testing.

gregsite/settings/testing.py

+from .base import *
+
+AUTHENTICATION_BACKENDS = [
+    "gregui.authentication.auth_backends.DevBackend",  # Fake dev backend
+    "django.contrib.auth.backends.ModelBackend",  # default
+    "gregui.authentication.auth_backends.GregOIDCBackend",
+    "sesame.backends.ModelBackend",  # link login
+]
+
+OIDC_RP_CLIENT_ID = "lalalalala"
+OIDC_RP_CLIENT_SECRET = "lalalalala"
+
+LOGIN_REDIRECT_URL = "http://localhost:3000/"
+LOGOUT_REDIRECT_URL = "http://localhost:3000/"
+
+CSRF_COOKIE_SAMESITE = "Strict"
+SESSION_COOKIE_SAMESITE = "Lax"
+# CSRF_COOKIE_HTTPONLY = True
+# SESSION_COOKIE_HTTPONLY = True
+
+
+ALLOWED_HOSTS += ["localhost", "127.0.0.1"]
+# EMAIL_HOST = "smtp.uio.no"
+# EMAIL_PORT = "468"
+# EMAIL_USE_SSL = True
+# EMAIL_TIMEOUT = 2
+# DEFAULT_FROM_EMAIL = "noreply@uio.no"
+EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
+
+ORGREG_CLIENT = {
+    "endpoints": {"base_url": "https://example.com/fake/"},
+    "headers": {"X-Gravitee-Api-Key": "bar"},
+}
+
+Q_CLUSTER = {
+    "name": "greg",
+    "workers": 4,
+    "timeout": 90,
+    "retry": 120,
+    "queue_limit": 50,
+    "bulk": 10,
+    "orm": "default",
+    "sync": True,
+}