Add cyborg-tempest-plugin to required-projects and remove octavia

This commit adds opendev.org/openstack/cyborg-tempest-plugin to
required-projects to pass the plugin-sanity-check job. It's a new
tempest plugin. It doesn't work properly on master yet. So, I put it on
the BLACKLIST.

And this commit also removes octavia because octavia tempest tests were
already migrated to octavia-tempest-plugin, and there is no tempest test
in the octavia repo. The removal patch[0] in octavia was already merged.

[0] https://review.opendev.org/#/c/659516/

Change-Id: Ied13dbf774472e1c36dca4ccca157104a81fbf9d
diff --git a/.zuul.yaml b/.zuul.yaml
index e3210fe..cdeefe1 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -363,6 +363,7 @@
       - opendev.org/openstack/cinder-tempest-plugin
       - opendev.org/openstack/cloudkitty-tempest-plugin
       - opendev.org/openstack/congress-tempest-plugin
+      - opendev.org/openstack/cyborg-tempest-plugin
       - opendev.org/openstack/designate-tempest-plugin
       - opendev.org/openstack/ec2api-tempest-plugin
       - opendev.org/openstack/freezer
@@ -405,7 +406,6 @@
       - opendev.org/openstack/neutron-vpnaas
       - opendev.org/x/nova-lxd
       - opendev.org/x/novajoin-tempest-plugin
-      - opendev.org/openstack/octavia
       - opendev.org/openstack/octavia-tempest-plugin
       - opendev.org/openstack/oswin-tempest-plugin
       - opendev.org/openstack/panko