Flush address from tunnel interface

Related-Prod: PRODX-3456
Change-Id: I6bb4f733b77f0c4be7dc7b8385d65225d64d4042
diff --git a/de/heat-templates/scripts/instance_boot.sh b/de/heat-templates/scripts/instance_boot.sh
index 7a4a599..dae11d4 100644
--- a/de/heat-templates/scripts/instance_boot.sh
+++ b/de/heat-templates/scripts/instance_boot.sh
@@ -534,6 +534,13 @@
 
     # NOTE(vsaienko): give some time to apply changes
     sleep 15
+
+# Remove Tunnel interface from netplan
+if [[ $TUNNEL_INTERFACE_NETPLAN_MANAGE == false ]]; then
+    ip addr flush ${TUNNEL_INTERFACE}
+    ip link set ${TUNNEL_INTERFACE} up
+fi
+
 }
 
 $functions_override