Fixes wrong exception in Docker VM implementation.

gns3server/modules/docker/docker_vm.py

@@ -27,7 +27,6 @@ import aiohttp
 import json
 import os
 
-from ...ubridge.hypervisor import Hypervisor
 from .docker_error import *
 from ..base_vm import BaseVM
 from ..adapters.ethernet_adapter import EthernetAdapter
@@ -765,7 +764,7 @@ class DockerVM(BaseVM):
 
         adapter = "bridge{}".format(adapter_number)
         if not self._ubridge_hypervisor or not self._ubridge_hypervisor.is_running():
-            raise VMwareError("Cannot start the packet capture: uBridge is not running")
+            raise DockerError("Cannot start the packet capture: uBridge is not running")
         yield from self._ubridge_hypervisor.send('bridge start_capture {name} "{output_file}"'.format(name=adapter, output_file=output_file))
 
     @asyncio.coroutine
@@ -778,7 +777,7 @@ class DockerVM(BaseVM):
 
         adapter = "bridge{}".format(adapter_number)
         if not self._ubridge_hypervisor or not self._ubridge_hypervisor.is_running():
-            raise VMwareError("Cannot stop the packet capture: uBridge is not running")
+            raise DockerError("Cannot stop the packet capture: uBridge is not running")
         yield from self._ubridge_hypervisor.send("bridge stop_capture {name}".format(name=adapter))
 
     @asyncio.coroutine