fix callBigDLFunc return a Int while the true return value from java is a byte array. (#3111)
fix callBigDLFunc return a Int while the true return value from java is a byte array. (#3111)


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