*: fix legacy imports

This change reorganizes imports and renames the legacy flask extensions.

endpoints/realtime.py

@@ -2,13 +2,16 @@ import logging
 import json
 
 from flask import request, Blueprint, abort, Response
-from flask.ext.login import current_user
-from auth.auth import require_session_login
+from flask_login import current_user
+
 from app import userevents
+from auth.auth import require_session_login
 from data.userevent import CannotReadUserEventsException
 
+
 logger = logging.getLogger(__name__)
 
+
 realtime = Blueprint('realtime', __name__)