add nexus release to pom
add nexus release to pom

122689305/BigDL,jenniew/BigDL,zhangxiaoli73/BigDL,wzhongyuan/BigDL,zhichao-li/BigDL,sethah/BigDL,dding3/BigDL,zhangxiaoli73/BigDL,yiheng/BigDL,122689305/BigDL,psyyz10/BigDL,psyyz10/BigDL,luchy0120/BigDL,qiuxin2012/BigDL,yiheng/BigDL,JerryYanWan/BigDL,zhangxiaoli73/BigDL,luchy0120/BigDL,JerryYanWan/BigDL,i8run/BigDL-1,dding3/BigDL,wzhongyuan/BigDL,zhichao-li/BigDL,zhichao-li/BigDL,qiuxin2012/BigDL,wzhongyuan/BigDL,sethah/BigDL,qiuxin2012/BigDL,i8run/BigDL-1,sethah/BigDL,SeaOfOcean/BigDL,jenniew/BigDL,psyyz10/BigDL,122689305/BigDL,dding3/BigDL,dding3/BigDL,luchy0120/BigDL,JerryYanWan/BigDL,SeaOfOcean/BigDL,i8run/BigDL-1,zhichao-li/BigDL,SeaOfOcean/BigDL,yiheng/BigDL,jenniew/BigDL