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/metadata/service/master/cluster.yml b/metadata/service/master/cluster.yml
index 4995be5..bba8867 100644
--- a/metadata/service/master/cluster.yml
+++ b/metadata/service/master/cluster.yml
@@ -32,7 +32,8 @@
         dns:
           enabled: true
           replicas: 1
-          autoscaler: True
+          autoscaler:
+            enabled: true
           domain: cluster.local
           server: 10.254.0.10
           dnsmasq:
diff --git a/metadata/service/master/single.yml b/metadata/service/master/single.yml
index f6dacbe..4a52299 100644
--- a/metadata/service/master/single.yml
+++ b/metadata/service/master/single.yml
@@ -27,7 +27,8 @@
         dns:
           enabled: true
           replicas: 1
-          autoscaler: True
+          autoscaler:
+            enabled: true
           domain: cluster.local
           server: 10.254.0.10
           dnsmasq: