Blacklist failing x/vmware-nsx-tempest-plugin

Tempest sanity job is 100% failing on x/vmware-nsx-tempest-plugin.
Adding this plugin until it is fixed.

- https://zuul.opendev.org/t/openstack/build/45f6c8d3c62d4387a70b7b471ec687c8
- https://zuul.opendev.org/t/openstack/builds?job_name=tempest-tox-plugin-sanity-check

Change-Id: I9c23582e5930156db21b609bc9031ee47e9d6326
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index 74e806b..eef5886 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -62,6 +62,9 @@
     'x/mogan',
     # mogan is unmaintained now, remove from the list when this is merged:
     # https://review.opendev.org/c/x/mogan/+/767718
+    'x/vmware-nsx-tempest-plugin'
+    # Failing since 2021-08-27
+    # https://zuul.opendev.org/t/openstack/build/45f6c8d3c62d4387a70b7b471ec687c8
 ]
 
 url = 'https://review.opendev.org/projects/'