Catch more error to avoid dead lock at project close

gns3server/controller/node.py

@@ -342,7 +342,7 @@ class Node:
         try:
             yield from self.post("/stop")
         # We don't care if a compute is down at this step
-        except aiohttp.errors.ClientOSError:
+        except (aiohttp.errors.ClientOSError, aiohttp.web.HTTPNotFound, aiohttp.web.HTTPConflict):
             pass
 
     @asyncio.coroutine