These commands list users editing and watching locked files. This trivial
implementation always returns an empty response, since git-cvsserver does not
implement file locking.
Without this, TkCVS hangs at startup, waiting forever for a response.
Signed-off-by: Damien Diederen <dash@foobox.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>