dirty workaround to make aaa lab passing

Change-Id: I82e26f1e4a5a5bf2bbe5e4d64a72b3e6e3b60309
diff --git a/classes/cluster/aaa-ha-freeipa/aaa/linux-system-single/rhel.yml b/classes/cluster/aaa-ha-freeipa/aaa/linux-system-single/rhel.yml
new file mode 100644
index 0000000..38dba03
--- /dev/null
+++ b/classes/cluster/aaa-ha-freeipa/aaa/linux-system-single/rhel.yml
@@ -0,0 +1,4 @@
+classes:
+- system.linux.system.single
+
+# RHEL family overrides