Handlers: cleanup and fixes.

gns3server/compute/docker/__init__.py

@@ -22,7 +22,6 @@ Docker server module.
 import asyncio
 import logging
 import aiohttp
-import urllib
 import json
 from gns3server.utils import parse_version
 

gns3server/compute/virtualbox/__init__.py

@@ -155,7 +155,7 @@ class VirtualBox(BaseManager):
                 continue
 
     @asyncio.coroutine
-    def list_images(self):
+    def list_vms(self):
         """
         Gets VirtualBox VM list.
         """