The test suite for git-pack-objects(1) is quite huge, and we're about to
add more tests that relate to the `--stdin-packs` option. Split out all
tests related to this option into a standalone file so that it becomes
easier to test the feature in isolation.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
