MINOR: connection: Add a CTL flag to notify mux it should wait for reads again

MUX_SUBS_RECV ctl flag is added to instruct the mux it should wait for read
events. This flag will be pretty useful to handle abortonclose option.

(cherry picked from commit e5cffa8ace3b9a3d6a634d8754380e699909ad3a)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed