Fix initctl debug toggle regression introduced in ae09272b

Calling `initctl debug` is supposed to toggle Finit debug messages on
the boot console.  This broke in ae09272b when improving support for
running Finit in containers.

Part of this change is a slight refactor of who calles log_init() when
starting up, and when to call ttinit().  We now call ttinit() every time
we toggle debug.

Also, toggling back to normal logging had a bug.  The new default log
level for Finit is LOG_INFO, but toggling back set it to LOG_NOTICE.

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

src/helpers.c

@@ -81,7 +81,7 @@ char *console(void)
 
 void console_init(void)
 {
-	ttinit();
+	log_init();
 }
 
 ssize_t cprintf(const char *fmt, ...)