MINOR: mux-fcgi: make the "show fd" helper also decode the fstrm subscriber when known

When dumping a live fcgi stream, also take the opportunity for reporting
the subscriber including the event, tasklet, handler and context.

(cherry picked from commit 1776ffb975017f91a12a9c6404bd3cb73789c7c7)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed