Add openstack-gateway labels

For proper Openstack Octavia with TungstenFabric work we need to add
openstack-gateway labels for worker nodes.

Related-Prod: PRODX-26105
Change-Id: I493a439064f085c1f938f4e84ed18d69f26df02c
diff --git a/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3.yaml b/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3.yaml
index 294fb6c..c4646e2 100644
--- a/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3.yaml
+++ b/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3.yaml
@@ -32,7 +32,7 @@
   tun_network_ext_router_ip: '10.15.0.131'
   private_floating_interface: 'ens4'
   tunnel_interface: 'ens8'
-  worker_metadata: {"labels": {"openstack-control-plane":"enabled","local-volume-provisioner": "enabled"}}
+  worker_metadata: {"labels": {"openstack-control-plane":"enabled","openstack-gateway": "enabled","local-volume-provisioner": "enabled"}}
   cmp_metadata: {"labels": {"openstack-compute-node":"enabled","tfvrouter":"enabled", "role":"ceph-osd-node"}}
   ntw_metadata: {"labels": {"tfconfig":"enabled","tfconfigdb":"enabled","tfcontrol":"enabled","tfanalytics":"enabled","tfanalyticsdb":"enabled","tfwebui":"enabled","local-volume-provisioner": "enabled"}}
   # hardware_metadata which is used for Ceph requires flavor with