Suspend the GNS3 VM

Fix #656

gns3server/controller/gns3vm/remote_gns3_vm.py

@@ -63,6 +63,13 @@ class RemoteGNS3VM(BaseGNS3VM):
                 return
         raise GNS3VMError("Can't start the GNS3 VM remote VM {} not found".format(self.vmname))
 
+    @asyncio.coroutine
+    def suspend(self):
+        """
+        Suspend do nothing for remote server
+        """
+        self.running = False
+
     @asyncio.coroutine
     def stop(self):
         """