chore: drop references to the local roadmap from code and tests

Comments, docstrings and live test names cited item IDs of a roadmap
that is not part of the repository. They now say what is meant, or
nothing where the sentence stands without them. Test assertions and
behavior are unchanged.

instances/utils.py

@@ -20,7 +20,7 @@ def can_open_console(user, instance):
     The single rule for console access (noVNC page, novncd, the virt-viewer
     .vv file and the VDI URL): an active superuser or an active owner of the
     VM. The global view_instances permission is read-only and does not grant
-    an interactive console (ROADMAP S-09).
+    an interactive console.
     """
     if not user.is_active:
         return False