Add powerdns formula installation

In order to be able to install designate with powerdns
backend, we need to have powerdns formula installed
by master state.

Change-Id: Ida9266246027200a78b983251ca0c3f2800d7e81
diff --git a/salt/master/formula/pkg/foundation.yml b/salt/master/formula/pkg/foundation.yml
index 3eed5e9..3111419 100644
--- a/salt/master/formula/pkg/foundation.yml
+++ b/salt/master/formula/pkg/foundation.yml
@@ -28,6 +28,9 @@
             openldap:
               source: pkg
               name: salt-formula-openldap
+            powerdns:
+              source: pkg
+              name: salt-formula-powerdns
             lldp:
               source: pkg
               name: salt-formula-lldp