Skip iptables act/stby test based on topology set

Task: 35877
Story: 2006260

Change-Id: I53671c7e93737b0d7bc038b4dd136a179facd34a
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 5c89676..db5e924 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -502,6 +502,7 @@
           "$TEMPEST_CONFIG":
             load_balancer:
               check_timeout: 180
+              loadbalancer_topology: 'ACTIVE_STANDBY'
       tempest_test_regex: ^octavia_tempest_plugin.tests.act_stdby_scenario.v2.test_active_standby_iptables
       tox_envlist: all