webui: fix webui specific metadata
    
    Mark all Web UI specific metadata so they could be filtered out
    in the API Browser.
    
    Fix cert name.
    
    https://fedorahosted.org/freeipa/ticket/3129
    
    Reviewed-By: Martin Kosek <mkosek@redhat.com>
    Reviewed-By: Tomas Babej <tbabej@redhat.com>