[CVP] Second review of rally scenarios

Related-PROD: PROD-30787
Change-Id: I107070e170ac9a2805188d9c017a15d6aabc40fa
diff --git a/rally/rally_scenarios_fip_and_ubuntu_100.json b/rally/rally_scenarios_fip_and_ubuntu_100.json
index 2e6f7b9..64f4d7a 100644
--- a/rally/rally_scenarios_fip_and_ubuntu_100.json
+++ b/rally/rally_scenarios_fip_and_ubuntu_100.json
@@ -7,7 +7,7 @@
 {% set times = 100 %}
 {% set users = 3 %}
 {% set tenants = 3 %}
-{% set ext_net_id = "${PUBLIC_NET}" %}
+{% set ext_net_id = "EXT_NET_ID" %}
 {% set fixed_net = "${FIXED_NET}" %}
 {% set script_file = script_file or "/home/rally/instance_test.sh" %}
 {% set block_migration = false %}