MINOR: quic: support CONNECTION_CLOSE_APP emission

Complete quic-conn API for error reporting. A new parameter <app> is
defined in the function quic_set_connection_close(). This will transform
the frame into a CONNECTION_CLOSE_APP type.

This type of frame will be generated by the applicative layer, h3 or
hq-interop for the moment. A new function qcc_emit_cc_app() is exported
by the MUX layer for them.
5 files changed