Add QoS support for neutron

Added "qos" option to enable qos support for openvswith and sriov.
Set qos false by default.

Depends-on change for reclass/system
https://gerrit.mcp.mirantis.net/#/c/5999

Change-Id: Ia2daf0024c5de56518ec6b5a1eac77d8fd9d5d4f
diff --git a/metadata/service/gateway/single.yml b/metadata/service/gateway/single.yml
index a9628f0..fe7b886 100644
--- a/metadata/service/gateway/single.yml
+++ b/metadata/service/gateway/single.yml
@@ -18,6 +18,7 @@
       dvr: false
       external_access: True
       security_groups_enabled: true
+      qos: false
       metadata:
         host: ${_param:cluster_vip_address}
         password: ${_param:metadata_password}