HADOOP-16054. Update Dockerfile to use Bionic (#1966)
HADOOP-16054. Update Dockerfile to use Bionic (#1966)


apache/hadoop,nandakumar131/hadoop,mapr/hadoop-common,wwjiang007/hadoop,apache/hadoop,steveloughran/hadoop,apurtell/hadoop,plusplusjiajia/hadoop,apurtell/hadoop,nandakumar131/hadoop,wwjiang007/hadoop,JingchengDu/hadoop,steveloughran/hadoop,plusplusjiajia/hadoop,steveloughran/hadoop,apache/hadoop,nandakumar131/hadoop,JingchengDu/hadoop,apurtell/hadoop,mapr/hadoop-common,wwjiang007/hadoop,mapr/hadoop-common,plusplusjiajia/hadoop,plusplusjiajia/hadoop,nandakumar131/hadoop,wwjiang007/hadoop,JingchengDu/hadoop,apache/hadoop,apache/hadoop,steveloughran/hadoop,apurtell/hadoop,apache/hadoop,wwjiang007/hadoop,nandakumar131/hadoop,apurtell/hadoop,steveloughran/hadoop,mapr/hadoop-common,JingchengDu/hadoop,JingchengDu/hadoop,apurtell/hadoop,JingchengDu/hadoop,wwjiang007/hadoop,wwjiang007/hadoop,plusplusjiajia/hadoop,plusplusjiajia/hadoop,steveloughran/hadoop,JingchengDu/hadoop,plusplusjiajia/hadoop,mapr/hadoop-common,nandakumar131/hadoop,steveloughran/hadoop,apurtell/hadoop,mapr/hadoop-common,apache/hadoop,mapr/hadoop-common,nandakumar131/hadoop