HTTP/2: introduced separate handler to retry stream close.
HTTP/2: introduced separate handler to retry stream close.

When ngx_http_v2_close_stream_handler() is used to retry stream close
after queued frames are sent, client timeouts on the stream can be
logged multiple times and/or in addition to already happened errors.
To resolve this, separate ngx_http_v2_retry_close_stream_handler()
was introduced, which does not try to log timeouts.

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx