Bug 1453616 Disable buildbot periodic file updates r=Callek

Summary:
Disable just the buildbot version of the periodic file updates in the file_update action.
Removing the code will happen later.

Reviewers: Callek

Reviewed By: Callek

Bug #: 1453616

Differential Revision: https://phabricator.services.mozilla.com/D921

taskcluster/taskgraph/target_tasks.py

@@ -619,5 +619,5 @@ def target_tasks_file_update(full_task_graph, parameters, graph_config):
     """
     def filter(task):
         # For now any task in the repo-update kind is ok
-        return task.kind in ['repo-update', 'repo-update-bb']
+        return task.kind in ['repo-update']
     return [l for l, t in full_task_graph.tasks.iteritems() if filter(t)]