Revert D33198155: Bump version number to 7 and compile old operators with old schema
Test Plan: revert-hammer
Differential Revision:
D33198155 (https://github.com/pytorch/pytorch/commit/d35fc409ad84c1a837e7e07ffe3f4e4942538e50)
Original commit changeset: 38a1185f9ecb
Original Phabricator Diff: D33198155 (https://github.com/pytorch/pytorch/commit/d35fc409ad84c1a837e7e07ffe3f4e4942538e50)
fbshipit-source-id: 411aaeb4e047aad9202db50d4d0f2ff35bc51f9d
