Replace verbose and kernel quiet modes with silent and quiet

This patch replaces the verbose and kernel-quiet runtime options with
a (hopefully) more useful quiet and silent modes of operation.

By default Finit progressively shows all services it starts at boot, but
when boot has completed and services are started/restarted Finit prints
nothing.  If `--disable-quiet` is given all started/restared/stoppping
messages are shown even after boot.

However, if `--enable-silent` is given Finit is completely silent even
at boot, no progress is shown, until the first service is started, which
on most systems is login.

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

sig.c

@@ -68,8 +68,8 @@ void do_shutdown(int sig)
 
 	/* If we enabled terse mode at boot, restore to previous setting at shutdown */
 	if (quiet) {
-		verbose = VERBOSE_MODE;
-		if (verbose) {
+		silent = SILENT_MODE;
+		if (!silent) {
 			sched_yield();
 			fputs("\n", stderr);
 		}