remote-hg: add missing config for basic tests 'hg commit' fails otherwise in some versions of mercurial because of the missing user information. Other versions simply throw a warning and guess though. Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com> Signed-off-by: Jeff King <peff@peff.net>