t5601: add tests for ssh Add more tests testing all the combinations: -IPv4 or IPv6 -path starting with "/" or with "/~" -with and without the ssh:// scheme Some tests fail; they need updates in connect.c Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>