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/controller/project.py

@@ -36,8 +36,9 @@ from .udp_link import UDPLink
 from ..config import Config
 from ..utils.path import check_path_allowed, get_default_project_directory
 from ..utils.asyncio.pool import Pool
-from ..utils.asyncio import locked_coroutine, asyncio_ensure_future
+from ..utils.asyncio import locking
 from ..utils.asyncio import wait_run_in_executor
+from ..utils.asyncio import asyncio_ensure_future
 from .export_project import export_project
 from .import_project import import_project
 
@@ -524,7 +525,8 @@ class Project:
             self.dump()
         return node
 
-    @locked_coroutine
+    @locking
+    @asyncio.coroutine
     def __delete_node_links(self, node):
         """
         Delete all link connected to this node.
@@ -814,7 +816,8 @@ class Project:
     def _topology_file(self):
         return os.path.join(self.path, self._filename)
 
-    @locked_coroutine
+    @locking
+    @asyncio.coroutine
     def open(self):
         """
         Load topology elements