clone -q: honor "quiet" option over native transports.

The earlier built-in conversion seems to have broken "git-clone"; this
teaches the command to honor the "-q" option again when talking to the
remote end over native transports (file://, git:// and ssh://).

Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport.c

@@ -645,7 +645,9 @@ static int fetch_refs_via_pack(struct transport *transport,
 	args.lock_pack = 1;
 	args.use_thin_pack = data->thin;
 	args.include_tag = data->followtags;
-	args.verbose = transport->verbose > 0;
+	args.verbose = (transport->verbose > 0);
+	args.quiet = args.no_progress = (transport->verbose < 0);
+	args.no_progress = !isatty(1);
 	args.depth = data->depth;
 
 	for (i = 0; i < nr_heads; i++)