Set mgmt interfaces to dhcp in contrail-labs

Closes-bug: #PROD-23882

Change-Id: I0d9faa34f92d4e771e28a7fe7e9ab1e33f3990ff
diff --git a/classes/cluster/os-ha-contrail/opencontrail/control.yml b/classes/cluster/os-ha-contrail/opencontrail/control.yml
index 4dff206..22eca9c 100644
--- a/classes/cluster/os-ha-contrail/opencontrail/control.yml
+++ b/classes/cluster/os-ha-contrail/opencontrail/control.yml
@@ -35,6 +35,7 @@
   linux:
     network:
       interface:
+        eth0: ${_param:linux_dhcp_interface}
         eth1:
           enabled: true
           type: eth