Add external interface on proxy node

Modified labs:
- cookied-cicd-pike-ovs-sl
- cookied-cicd-pike-dvr-sl
- context-pike-ovs-dpdk

Change-Id: I2854c96dab3a6a95d4f20d9a5577549363c55495
Related-Bug: PROD-22111
diff --git a/tcp_tests/templates/cookied-cicd-pike-dvr-sl/environment_context.yaml b/tcp_tests/templates/cookied-cicd-pike-dvr-sl/environment_context.yaml
index 24c36e5..4025792 100644
--- a/tcp_tests/templates/cookied-cicd-pike-dvr-sl/environment_context.yaml
+++ b/tcp_tests/templates/cookied-cicd-pike-dvr-sl/environment_context.yaml
@@ -123,13 +123,17 @@
     prx01:
       reclass_storage_name: openstack_proxy_node01
       roles:
-      - openstack_proxy
+      #- openstack_proxy  # another VIP interface used
       - linux_system_codename_xenial
       interfaces:
         ens3:
           role: single_dhcp
         ens4:
           role: single_ctl
+        ens5:
+          role: single_external
+          external_address: 172.17.16.121
+          external_network_netmask: 255.255.255.0
 
     mon01:
       reclass_storage_name: stacklight_server_node01