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>

exec.c

@@ -172,7 +172,7 @@ int run_interactive(char *cmd, char *fmt, ...)
 		return 1;
 	}
 
-	if (verbose && fmt) {
+	if (!silent && fmt) {
 		va_start(ap, fmt);
 		vsnprintf(line, sizeof(line), fmt, ap);
 		va_end(ap);
@@ -204,7 +204,7 @@ int run_interactive(char *cmd, char *fmt, ...)
 		}
 	}
 
-	if (verbose && fmt)
+	if (!silent && fmt)
 		print_result(status);
 
 	/* Dump any results of cmd on stderr after we've printed [ OK ] or [FAIL]  */