rename cluster levels to non-underscore names

Change-Id: Ic9bdafbeb1333699ce424612f8b2e8d8dafb7be2
diff --git a/classes/cluster/drivetrain-ha-clusters/cicd/worker.yml b/classes/cluster/drivetrain-ha-clusters/cicd/worker.yml
new file mode 100644
index 0000000..7d856cc
--- /dev/null
+++ b/classes/cluster/drivetrain-ha-clusters/cicd/worker.yml
@@ -0,0 +1,6 @@
+classes:
+- system.linux.system.single
+- system.jenkins.slave.docker
+- system.aptly.client.publisher
+- cluster.drivetrain-ha-clusters
+