Merge branch '2.1' into 2.2

# Conflicts:
#	gns3server/compute/docker/docker_vm.py
#	gns3server/controller/compute.py
#	gns3server/controller/gns3vm/__init__.py
#	gns3server/controller/link.py
#	gns3server/controller/project.py
#	gns3server/handlers/api/controller/project_handler.py
#	gns3server/handlers/api/controller/server_handler.py
#	gns3server/utils/asyncio/__init__.py
#	gns3server/utils/asyncio/telnet_server.py
#	gns3server/version.py
#	gns3server/web/web_server.py
#	tests/compute/qemu/test_qemu_vm.py

gns3server/compute/base_node.py

@@ -29,7 +29,7 @@ import re
 
 from gns3server.utils.interfaces import interfaces
 from ..compute.port_manager import PortManager
-from ..utils.asyncio import wait_run_in_executor, locked_coroutine
+from ..utils.asyncio import wait_run_in_executor, locking
 from ..utils.asyncio.telnet_server import AsyncioTelnetServer
 from ..ubridge.hypervisor import Hypervisor
 from ..ubridge.ubridge_error import UbridgeError
@@ -547,7 +547,8 @@ class BaseNode:
         except UbridgeError as e:
             raise UbridgeError("Error while sending command '{}': {}: {}".format(command, e, self._ubridge_hypervisor.read_stdout()))
 
-    @locked_coroutine
+    @locking
+    @asyncio.coroutine
     def _start_ubridge(self):
         """
         Starts uBridge (handles connections to and from this node).