Fix the var to avoid error in cicd

gen-vars.py

@@ -38,7 +38,7 @@ if floating_ip == "":
 floating_ip_id = check_output('openstack floating ip list -c ID --sort-column ID --status DOWN -f value', shell=True).split("\n")[0]
 
 var['external_net'] = external_net
-var['internal-net'] = internal_net
+var['internal_net'] = internal_net
 var['instance_floating_ip_net']= external_net
 var['floating_ip']= floating_ip_id
 var['ssh_host'] = host_prefix.format(floating_ip.split('.')[-1])