* Fix bug that promised stream was not reset by returning
NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE from
nghttp2_on_header_callback. Instead, associated stream was reset.
* Allow NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE from
nghttp2_on_begin_headers_callback
* h2load: Effectively disable flow control by setting large
window size
* asio: Graceful shutdown and joinable server (Patch from
Xiaoguang Sun)
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/nghttp2?expand=0&rev=15
