support pre-convert filter format for mkldnn training mode and change 'OptimizeForIde...

support pre-convert filter format for mkldnn training mode and change 'OptimizeForIdeep' to 'OptimizeForMkldnn' (#15171)

Summary:
For MKL-DNN,the filter data will be reorderd to primitive format, it takes a lot of time.
So the patch provide a method to convert filter format before training.
And "OptimizeForIdeep" will be changed to "OptimizeForMkldnn" in this patch.
 This patch depends on https://github.com/pytorch/pytorch/pull/12866
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15171

Differential Revision: D14590741

Pulled By: yinghai

fbshipit-source-id: 07971c9977edac3c8eec08ca2c39cda639683492