nghttpx --no-http2-cipher-black-list and
--client-no-http2-cipher-black-list are deprecated and replaced with
--no-http2-cipher-block-list and --client-no-http2-cipher-block-list
respectively.

h2load: Add --rps option

on_stream_close is called after on_frame_not_send_callback with
success=false without this function.