Summary:
Tree manifests want to have a different order than flat manifests.
This difference in orders can cause algorithms like diff to give wrong
results. This test aims to validate that the treemanifest implemetations
work correctly for cases where the orders are different.
Reviewed By: quark-zju
Differential Revision: D17492500
fbshipit-source-id: eabb5d0fed5804b3d81c12667621ec6d38e0bfce