Add DHCP discovery for ens6 interface on contrail envs

Closes-Bug: PROD-34210
Change-Id: I83ea0fe222b8f83bb2041541f082bdf1fc5e68ed
diff --git a/tcp_tests/templates/heat-cicd-queens-contrail41-sl/salt-context-environment.yaml b/tcp_tests/templates/heat-cicd-queens-contrail41-sl/salt-context-environment.yaml
index 59f67ba..a644c0d 100644
--- a/tcp_tests/templates/heat-cicd-queens-contrail41-sl/salt-context-environment.yaml
+++ b/tcp_tests/templates/heat-cicd-queens-contrail41-sl/salt-context-environment.yaml
@@ -247,6 +247,8 @@
           role: single_dhcp
         ens4:
           role: single_ctl
+        ens6:
+          role: single_dhcp
 
     ntw02:
       reclass_storage_name: opencontrail_control_node02
@@ -258,6 +260,8 @@
           role: single_dhcp
         ens4:
           role: single_ctl
+        ens6:
+          role: single_dhcp
 
     ntw03:
       reclass_storage_name: opencontrail_control_node03
@@ -269,6 +273,8 @@
           role: single_dhcp
         ens4:
           role: single_ctl
+        ens6:
+          role: single_dhcp
 
     mtr01:
       reclass_storage_name: stacklight_telemetry_node01