Add an optional tenant flow log offload test

This patch adds an optional tenant flow log offload scenario test
that checks the tenant flow logging offload and format.

Change-Id: I8a7ed4e1bc3d567c4807726c684ad86cd281096f
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 38b2d04..fd19a10 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -426,6 +426,10 @@
           $OCTAVIA_CONF:
             api_settings:
               api_v1_enabled: False
+        test-config:
+          "$TEMPEST_CONFIG":
+            loadbalancer-feature-enabled:
+              log_offload_enabled: True
       tempest_concurrency: 2
       tempest_test_regex: ^octavia_tempest_plugin.tests.scenario.v2
       tox_envlist: all
@@ -479,6 +483,12 @@
     required-projects:
       - name: openstack/diskimage-builder
         override-checkout: 2.30.0
+    vars:
+      devstack_local_conf:
+        test-config:
+          "$TEMPEST_CONFIG":
+            loadbalancer-feature-enabled:
+              log_offload_enabled: False
 
 # Legacy jobs for the transition to the act-stdby two node jobs
 - job: