*: fix legacy imports

This change reorganizes imports and renames the legacy flask extensions.

endpoints/web.py

@@ -1,13 +1,12 @@
 import json
 import logging
 
-from urlparse import urlparse
 from datetime import timedelta
 
 from cachetools import lru_cache
 from flask import (abort, redirect, request, url_for, make_response, Response, render_template,
-                   Blueprint, send_from_directory, jsonify, send_file)
-from flask.ext.login import current_user
+                   Blueprint, jsonify, send_file)
+from flask_login import current_user
 
 import features
 
@@ -38,7 +37,6 @@ from util.systemlogs import build_logs_archive
 from util.useremails import send_email_changed
 
 
-
 @lru_cache(maxsize=1)
 def _get_route_data():
   return swagger_route_data(include_internal=True, compact=True)