Add pdns reclass

Change-Id: I53adeee281f928b2ec75803966390386200928e6
diff --git a/powerdns/server/single.yml b/powerdns/server/single.yml
new file mode 100644
index 0000000..13077de
--- /dev/null
+++ b/powerdns/server/single.yml
@@ -0,0 +1,6 @@
+classes:
+  - service.powerdns.server.single
+parameters:
+  powerdns:
+    server:
+      enabled: true