move some ops to contrib (#35282)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35282
move some ops to contrib: sls, batchnorm
Test Plan: https://our.intern.facebook.com/intern/testinfra/testrun/7599824379495916
Reviewed By: yinghai
Differential Revision: D20616678
fbshipit-source-id: 6dd8733f89f3932b4fdb127630dce132b9a60ebc
