Use OAM network for Robot public_net in TLAB HEAT

Change-Id: I2e0c698d8241ca88e90c3b965730245155094c12
Issue-ID: INT-414
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
diff --git a/test/ete/labs/tlab/onap-openstack-template.env b/test/ete/labs/tlab/onap-openstack-template.env
index e812cac..b10e479 100644
--- a/test/ete/labs/tlab/onap-openstack-template.env
+++ b/test/ete/labs/tlab/onap-openstack-template.env
@@ -71,6 +71,7 @@
   external_dns: 8.8.8.8
   dns_forwarder: 204.178.3.230
   oam_network_cidr: 10.0.0.0/16
+  use_oam_net_for_robot: true
 
   ### Private IP addresses ###