repack -A -d: use --keep-unreachable when repacking
repack -A -d: use --keep-unreachable when repacking

This is a safer variant of "repack -a -d" that does not drop
unreachable objects that are in packs.

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