service: give stop and reload scripts their own timeout

Both were bounded by killdelay, the delay between the stop signal and
SIGKILL, because service_run_script() had nothing else to reach for.
That conflates two things: how long the daemon may take to die, and
how long its stop script may run.

Give each hook a timeout of its own, defaulting to killdelay when
unset, so the existing behaviour is what you get until you ask for
something else.  parse_script() already falls back that way for the
hooks that had one.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/svc.h

@@ -221,9 +221,11 @@ typedef struct svc {
 
 	/* When set, used instead of SIGHUP or stop-start */
 	char	       reload_script[MAX_CMD_LEN];
+	int	       reload_tmo;
 
 	/* When set, used instead of SIGTERM or sysv 'stop' */
 	char	       stop_script[MAX_CMD_LEN];
+	int	       stop_tmo;
 
 	/*
 	 * Used to forcefully kill services that won't shutdown on