Add ipflush for manual interfaces

This should help with connectivity before compute reboots

Change-Id: I10ad157f5938b90cf1f92f2535a2481408e4a5a9
diff --git a/classes/cluster/os-ha-contrail/openstack/compute.yml b/classes/cluster/os-ha-contrail/openstack/compute.yml
index 8f15232..579eedd 100755
--- a/classes/cluster/os-ha-contrail/openstack/compute.yml
+++ b/classes/cluster/os-ha-contrail/openstack/compute.yml
@@ -34,6 +34,7 @@
       interface:
         ens4:
           enabled: true
+          ipflush_onchange: true
           type: eth
           proto: manual
           pre_up_cmds: