Fix cannot stop Docker VM while console connection is still active.

gns3server/compute/docker/docker_vm.py

@@ -481,6 +481,9 @@ class DockerVM(BaseNode):
                 await self._start_vnc_process(restart=True)
                 monitor_process(self._vnc_process, self._vnc_callback)
 
+            if self._console_websocket:
+                await self._console_websocket.close()
+                self._console_websocket = None
             await self._clean_servers()
 
             await self.manager.query("POST", "containers/{}/start".format(self._cid))
@@ -702,9 +705,7 @@ class DockerVM(BaseNode):
 
         self._console_websocket = await self.manager.websocket_query("containers/{}/attach/ws?stream=1&stdin=1&stdout=1&stderr=1".format(self._cid))
         input_stream.ws = self._console_websocket
-
         output_stream.feed_data(self.name.encode() + b" console is now available... Press RETURN to get started.\r\n")
-
         asyncio.ensure_future(self._read_console_output(self._console_websocket, output_stream))
 
     async def _read_console_output(self, ws, out):
@@ -727,13 +728,14 @@ class DockerVM(BaseNode):
                 out.feed_eof()
                 await ws.close()
                 break
-        await self.stop()
 
     async def reset_console(self):
         """
         Reset the console.
         """
 
+        if self._console_websocket:
+            await self._console_websocket.close()
         await self._clean_servers()
         await self._start_console()
 
@@ -778,6 +780,9 @@ class DockerVM(BaseNode):
         """
 
         try:
+            if self._console_websocket:
+                await self._console_websocket.close()
+                self._console_websocket = None
             await self._clean_servers()
             await self._stop_ubridge()