[Issue 1035] Allow layer regulazier set after model definition, add regulazier for cadd and cmul (#1048)
[Issue 1035] Allow layer regulazier set after model definition, add regulazier for cadd and cmul (#1048)

* Allow layer regulazier set after model definition

* add regulazier support for cadd and cmul

* meet code review

* add python set API, add regularizer to python cmul and cadd

* add test for setBRegularizer

* add parameters to create method, add doc

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