Explicitly configure the insecure_port for apiserver

Change-Id: I5f1aa6e382e99c7c719e9e596f1d0ad2f0d79157
diff --git a/metadata/service/master/cluster.yml b/metadata/service/master/cluster.yml
index 70ea012..0f8abad 100644
--- a/metadata/service/master/cluster.yml
+++ b/metadata/service/master/cluster.yml
@@ -18,6 +18,7 @@
       apiserver:
         address: ${_param:cluster_local_address}
         insecure_address: 127.0.0.1
+        insecure_port: 8080
       etcd:
         members:
           - host: ${_param:cluster_node01_address}