Building plugin documentation is failing for aodhclient when running
with latest pyparsing. Drop the plugin from docs for now until the issue
can be fixed.
Needed-By: https://review.opendev.org/c/openstack/requirements/+/818614/
Signed-off-by: Dr. Jens Harbott <harbott@osism.tech>
Change-Id: I1cc1efd9ff2004dd711ed9da0b1d9e8be31175f4