MINOR: mux-h1: Slightly Improve H1 traces

Connection and conn-stream pointers and flags are now dumped, if available,
in each trace messages. In addition, shutr and shutw mode is now reported.

(cherry picked from commit 99293b03807de8a357cf7153fcc0c15f716238c2)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed