fix interfaces for k8s and opencontrail

Change-Id: I70129e5f5e4da214ab2df82fca0a6e9140bf459e
diff --git a/classes/cluster/k8s_ha_contrail/opencontrail/compute.yml b/classes/cluster/k8s_ha_contrail/opencontrail/compute.yml
index 912e753..d6f92b6 100644
--- a/classes/cluster/k8s_ha_contrail/opencontrail/compute.yml
+++ b/classes/cluster/k8s_ha_contrail/opencontrail/compute.yml
@@ -23,3 +23,8 @@
     pool:
       network:
         hash: 2276df10feae8f09fb50dce3a96fff6c
+  linux:
+    network:
+      concat_iface_files:
+      - src: '/etc/network/interfaces.d/50-cloud-init.cfg'
+        dst: '/etc/network/interfaces'
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