This adds the custom_wsgi_process_options parameter to the horizon class that is passed down to the horizon::wsgi::apache class when configure_apache is set to true. Change-Id: I986aeb9766a777eaf82f1f2fccfed95b380dc4c7 (cherry picked from commitcd5216f5a5) (cherry picked from commit0613e18b33) (cherry picked from commit83e324363d)