fix interface configuration

Change-Id: I9b0cb4c18f785f13e8a69c19624f6c8c65a3ddaa
diff --git a/classes/cluster/os_aio_contrail/openstack/compute.yml b/classes/cluster/os_aio_contrail/openstack/compute.yml
index fd9efe0..3a606e0 100755
--- a/classes/cluster/os_aio_contrail/openstack/compute.yml
+++ b/classes/cluster/os_aio_contrail/openstack/compute.yml
@@ -112,6 +112,9 @@
           port: 11211
   linux:
     network:
+      concat_iface_files:
+      - src: '/etc/network/interfaces.d/50-cloud-init.cfg'
+        dst: '/etc/network/interfaces'
       interface:
         ens4:
           enabled: true