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/underlay.yaml b/tcp_tests/templates/cookied-cicd-pike-dvr-sl/underlay.yaml
index 5b871d7..2cbbce6 100644
--- a/tcp_tests/templates/cookied-cicd-pike-dvr-sl/underlay.yaml
+++ b/tcp_tests/templates/cookied-cicd-pike-dvr-sl/underlay.yaml
@@ -597,9 +597,26 @@
                   cloudinit_meta_data: *cloudinit_meta_data
                   cloudinit_user_data: *cloudinit_user_data_1604_swp
 
-              interfaces: *interfaces
-              network_config: *network_config
-
+              interfaces:
+                - label: ens3
+                  l2_network_device: admin
+                  interface_model: *interface_model
+                - label: ens4
+                  l2_network_device: private
+                  interface_model: *interface_model
+                - label: ens5
+                  l2_network_device: external
+                  interface_model: *interface_model
+              network_config:
+                ens3:
+                  networks:
+                    - admin
+                ens4:
+                  networks:
+                    - private
+                ens5:
+                  networks:
+                    - external
 
           - name: {{ HOSTNAME_CMP01 }}
             role: salt_minion