Add default rng backend class

Change-Id: Ic357d7d4d6d09e196f044c8bf9be356c2ca1fc42
Related-Bug: PROD-21832 (PROD:21832)
diff --git a/salt/control/cluster/init.yml b/salt/control/cluster/init.yml
new file mode 100644
index 0000000..49d30b3
--- /dev/null
+++ b/salt/control/cluster/init.yml
@@ -0,0 +1,9 @@
+parameters:
+  _param:
+    salt_control_cluster_rng_backend: "/dev/random"
+  salt:
+    control:
+      cluster:
+        internal:
+          rng:
+            backend: ${_param:salt_control_cluster_rng_backend}