[TF] Skip ActiveStandbyScenarioTest in case of TF

Skip an entire test class to avoid class setup actions.

Related-PROD: PRODX-20758
Change-Id: I34cab733e2e908e05636087afb101450c02c67c2
(cherry picked from commit 305f419be0b16ef51ad59c337b1186f1e96d1f7a)
(cherry picked from commit 7e0c2edfd659648f544f13b9a5850ea542c1dd4c)
diff --git a/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py b/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py
index 11b0cec..aee20e6 100644
--- a/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py
+++ b/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py
@@ -31,6 +31,8 @@
 LOG = logging.getLogger(__name__)
 
 
+@testtools.skipIf(CONF.load_balancer.provider == 'tungstenfabric',
+                  "Not supported by TungstenFabric")
 @testtools.skipUnless(
     CONF.validation.run_validation,
     'Active-Standby tests will not work without run_validation enabled.')