Locallyconnected1D (#1964)
Locallyconnected1D (#1964)

* add LocallyConnected1D, address review comments,  resolve conflicts, add serializer test

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