MINOR: debug: indicate the applet name when the task is task_run_applet()

This allows to figure what applet is currently being executed (and likely
hung).

(cherry picked from commit a512b02f67a30ab5519d04f8c8b1263415321c85)
[wt: backported to improve troubleshooting when the watchdog fires]
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed