*: fix legacy imports

This change reorganizes imports and renames the legacy flask extensions.

endpoints/oauthlogin.py

@@ -1,8 +1,9 @@
 import logging
+
 import requests
 
 from flask import request, redirect, url_for, Blueprint
-from flask.ext.login import current_user
+from flask_login import current_user
 from peewee import IntegrityError
 
 import features
@@ -20,6 +21,7 @@ logger = logging.getLogger(__name__)
 client = app.config['HTTPCLIENT']
 oauthlogin = Blueprint('oauthlogin', __name__)
 
+
 def render_ologin_error(service_name,
                         error_message='Could not load user data. The token may have expired.'):
   user_creation = features.USER_CREATION and features.DIRECT_LOGIN