Add option dns_domain for liberty
diff --git a/metadata/service/control/single.yml b/metadata/service/control/single.yml
index 7fc2d57..25e4531 100644
--- a/metadata/service/control/single.yml
+++ b/metadata/service/control/single.yml
@@ -6,6 +6,7 @@
       enabled: true
       plugin: ml2
       fwaas: false
+      dns_domain: novalocal
       tunnel_type: vxlan
       version: ${_param:neutron_version}
       bind:
@@ -36,4 +37,4 @@
         host: ${_param:single_address}
         user: nova
         password: ${_param:keystone_nova_password}
-        tenant: service
\ No newline at end of file
+        tenant: service