Add neutron_enable_qos option

Add option to enable QoS for Neutron.

Change-Id: I034aa1d88114a15c31862fa1fe813735173c312f
diff --git a/neutron/gateway/cluster.yml b/neutron/gateway/cluster.yml
index 99699f7..52462dd 100644
--- a/neutron/gateway/cluster.yml
+++ b/neutron/gateway/cluster.yml
@@ -2,8 +2,11 @@
 - service.neutron.gateway.single
 parameters:
   neutron:
+    _param:
+      neutron_enable_qos: False
     gateway:
       dvr: ${_param:neutron_gateway_dvr}
+      qos: ${_param:neutron_enable_qos}
       agent_mode: ${_param:neutron_gateway_agent_mode}
       backend:
         tenant_network_types: ${_param:neutron_tenant_network_types}"