t1006: modernize output comparisons
t1006: modernize output comparisons

In modern tests, we typically put output into a file and
compare it with test_cmp. This is nicer than just comparing
via "test", and much shorter than comparing via "test" and
printing a custom message.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git