travis: Automate updates to production-helper Nagios test.

This list was likely to end up out of date quickly, since it wasn't
documented that you need to update it when adding a queue.  The best
solution is to just not require it to be updated.

tools/test-queue-worker-reload

@@ -17,6 +17,7 @@ sanity_check.check_venv(__file__)
 
 from typing import IO, Text
 
+# TODO: Convert this to use scripts/lib/queue_workers.py
 TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
 successful_worker_launches = [
     'launching queue worker thread error_reports',