[Issue #1896] KerasModel support saving and loading from HDFS (#1929)
[Issue #1896] KerasModel support saving and loading from HDFS (#1929)

* add scala implementation

* KerasModel support saving and loading from HDFS

* fix

* first decide if path is local, if not forward to scala

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