Bump version number to 7 and compile old operators with old schema (#68358)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/68358
Test Plan: Imported from OSS
Reviewed By: samdow
Differential Revision: D33198155
Pulled By: tugsbayasgalan
fbshipit-source-id: 38a1185f9ecb34a33f737ad0b060b3490956300c
