Update octavia-tempest-plugin configref

This patch updates the octavia-tempest-plugin configuration reference
documentation to only include octavia-tempest-plugin specific
configuration options.
This simplifies our documentation and means bugs in other plugins will
not break our configuration reference docs job.

It also re-enables the docs job, disabled in a previous patch.

Change-Id: I53d81ca7bd910838927d594bfb0e72320b9d1ec6
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index e7b806d..a1c7e36 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -3,8 +3,7 @@
 - project:
     templates:
       - check-requirements
-      # TODO(tkajinam): Re-enable this
-      #- publish-openstack-docs-pti
+      - publish-openstack-docs-pti
       # TODO(gthiemonge): Re-enable this, pep8 is currently broken
       #- tempest-plugin-jobs
       - release-notes-jobs-python3