Add iptables-based active/standby scenario test

This patch adds a tempest scenario test for active/standby topology.

This scenario takes a similar approach to scenario proposed in Change-Id
Ibcd5552a67cea650edc72bfaa986357267ca2407 with the difference that it
does not rely on amphora stats API. Instead, it uses iptables to log VIP
traffic and make assertions based on logging.

Co-Authored-By: Michael Johnson <johnsomor@gmail.com>

Change-Id: I24a6fc3387166ec6cdbd57a5ca9f63743748ec68
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 8c8ac73..7548504 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -393,3 +393,66 @@
 - job:
     name: octavia-v2-dsvm-scenario-centos-7
     parent: octavia-v2-dsvm-py2-scenario-centos-7
+
+- job:
+    name: octavia-v2-act-stdby-dsvm-scenario
+    parent: octavia-dsvm-live-base
+    pre-run: playbooks/act_stby_iptables/pre.yaml
+    vars:
+      devstack_localrc:
+        OCTAVIA_USE_PREGENERATED_SSH_KEY: True
+        OCTAVIA_PREGENERATED_SSH_KEY_PATH: /tmp/octavia_ssh_key
+      devstack_local_conf:
+        post-config:
+          $OCTAVIA_CONF:
+            api_settings:
+              api_v1_enabled: False
+            controller_worker:
+              loadbalancer_topology: ACTIVE_STANDBY
+            task_flow:
+              engine: parallel
+              devstack_local_conf:
+        test-config:
+          "$TEMPEST_CONFIG":
+            load_balancer:
+              check_timeout: 180
+      tempest_test_regex: ^octavia_tempest_plugin.tests.act_stdby_scenario.v2.test_active_standby_iptables
+      tox_envlist: all
+
+- job:
+    name: octavia-v2-act-stdby-dsvm-py2-scenario
+    parent: octavia-v2-act-stdby-dsvm-scenario
+    vars:
+      devstack_localrc:
+        USE_PYTHON3: False
+
+- job:
+    name: octavia-v2-act-stdby-dsvm-py2-scenario-centos-7
+    parent: octavia-v2-act-stdby-dsvm-py2-scenario
+    nodeset: devstack-single-node-centos-7
+    vars:
+      devstack_localrc:
+        USE_PYTHON3: False
+        OCTAVIA_AMP_BASE_OS: centos
+        OCTAVIA_AMP_DISTRIBUTION_RELEASE_ID: 7
+        OCTAVIA_AMP_IMAGE_SIZE: 3
+      devstack_local_conf:
+        test-config:
+          "$TEMPEST_CONFIG":
+            load_balancer:
+              amphora_ssh_user: centos
+
+- job:
+    name: octavia-v2-act-stdby-dsvm-scenario-stable-stein
+    parent: octavia-v2-act-stdby-dsvm-scenario
+    override-checkout: stable/stein
+
+- job:
+    name: octavia-v2-act-stdby-dsvm-py2-scenario-stable-rocky
+    parent: octavia-v2-act-stdby-dsvm-py2-scenario
+    override-checkout: stable/rocky
+
+- job:
+    name: octavia-v2-act-stdby-dsvm-py2-scenario-stable-queens
+    parent: octavia-v2-act-stdby-dsvm-py2-scenario
+    override-checkout: stable/queens