Use uuid4() for temporary node name while duplicating a node.

gns3server/compute/base_manager.py

@@ -282,7 +282,7 @@ class BaseManager:
         # We force a refresh of the name. This force the rewrite
         # of some configuration files
         node_name = destination_node.name
-        destination_node.name = node_name + "tmp"
+        destination_node.name = node_name + str(uuid4())
         destination_node.name = node_name
 
         return destination_node

gns3server/compute/dynamips/__init__.py

@@ -614,7 +614,7 @@ class Dynamips(BaseManager):
         source_node = self.get_node(source_node_id)
         destination_node = self.get_node(destination_node_id)
 
-        # Non router gears
+        # Not a Dynamips router
         if not hasattr(source_node, "startup_config_path"):
             return (yield from super().duplicate_node(source_node_id, destination_node_id))