disable rbac by default

Change-Id: I1a85fd967099dced0df0335afe3abdb12614c711
diff --git a/metadata/service/master/single.yml b/metadata/service/master/single.yml
index 4a52299..a8bc63a 100644
--- a/metadata/service/master/single.yml
+++ b/metadata/service/master/single.yml
@@ -19,6 +19,8 @@
         address: ${_param:single_address}
         insecure_address: 127.0.0.1
         insecure_port: 8080
+        daemon_opts:
+          anonymous-auth: false
       etcd:
         members:
           - host: ${_param:single_address}