update metadata for dns autoscaler

Using `enabled: True` to conform with the rest of metadata structures.
Introductiong poll-perios-seconds parameter

Change-Id: I127114ad6bcdd03476baad0c2d5831f2e953349e
diff --git a/tests/pillar/master_cluster.sls b/tests/pillar/master_cluster.sls
index 36cf4d5..c253e9d 100644
--- a/tests/pillar/master_cluster.sls
+++ b/tests/pillar/master_cluster.sls
@@ -11,7 +11,8 @@
         enabled: true
         replicas: 1
         server: 10.254.0.10
-        autoscaler: True
+        autoscaler:
+          enabled: true
       heapster_influxdb:
         enabled: true
         public_ip: 185.22.97.132