*: fix legacy imports

This change reorganizes imports and renames the legacy flask extensions.

test/test_auth.py

@@ -1,26 +1,27 @@
-import unittest
 import base64
+import unittest
+
 from datetime import datetime, timedelta
 
-from app import app
-from data import model
-from data.database import OAuthApplication, OAuthAccessToken
 from flask import g
-from flask.ext.principal import identity_loaded
+from flask_principal import identity_loaded
 
+from app import app
 from auth.auth import _process_basic_auth
 from auth.scopes import (scopes_from_scope_string, is_subset_string, DIRECT_LOGIN, ADMIN_REPO,
                          ALL_SCOPES)
 from auth.permissions import QuayDeferredPermissionUser
-from endpoints.api import api_bp, api
+from data import model
+from data.database import OAuthApplication, OAuthAccessToken
+from endpoints.api import api
 from endpoints.api.user import User, Signin
-
-import json as py_json
 from test.test_api_usage import ApiTestCase
 
+
 ADMIN_ACCESS_USER = 'devtable'
 DISABLED_USER = 'disabled'
 
+
 @identity_loaded.connect_via(app)
 def on_identity_loaded(sender, identity):
   g.identity = identity