Support NHWC for LRN and batch normalization, and optimize batch normalization speed (#1936)
Support NHWC for LRN and batch normalization, and optimize batch normalization speed (#1936)

* add LRN and LRNGrad

* add LRNGrad

* support bn with NHWC

* support bn with NHWC

* add batch norm grad

* support tf bnv2/bngradv2

* fix uts

* fix uts

* fix ut

* fix ut

* fix ut

* fix ut

* fix style issue

* fix ut

* fix ut

* fix ut

* update python api and docs

* meet code review

* meet code review

* fix ut

* fix ut

* fix ut

intel-analytics/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL