initctl: show exit status/signaled like systemctl

- Show if exited/signaled
 - Show status code and the std /NAME
 - Show signal value and the std /NAME

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

src/util.h

@@ -52,8 +52,10 @@ int   fnwrite      (char *value, char *fmt, ...);
 
 int   has_utmp     (void);
 int   strtobytes   (char *arg);
-void  do_sleep     (unsigned int sec);
+char *sig2str      (int sig);
+char *code2str     (int code);
 
+void  do_sleep     (unsigned int sec);
 long  jiffies      (void);
 char *uptime       (long secs, char *buf, size_t len);
 char *memsz        (uint64_t sz, char *buf, size_t len);