merge the append branch change log to the branch 0.21 change log.
merge the append branch change log to the branch 0.21 change log.

git-svn-id: 2e2a6e58738e093d17463559b7f09205972619c6@820439 13f79535-47bb-0310-9956-ffa450edef68

gigaroby/hops,tempbottle/hadoop-hdfs,steveloughran/hadoop-hdfs,gigaroby/hops,tempbottle/hadoop-hdfs,steveloughran/hadoop-hdfs,hopshadoop/hops,gabrielborgesmagalhaes/hadoop-hdfs,hopshadoop/hops,gabrielborgesmagalhaes/hadoop-hdfs,steveloughran/hadoop-hdfs,srijeyanthan/hops,smkniazi/hops,tempbottle/hadoop-hdfs,gabrielborgesmagalhaes/hadoop-hdfs,srijeyanthan/hops,robzor92/hops,gabrielborgesmagalhaes/hadoop-hdfs,smkniazi/hops,smkniazi/hops,gabrielborgesmagalhaes/hadoop-hdfs,gigaroby/hops,robzor92/hops,tempbottle/hadoop-hdfs,steveloughran/hadoop-hdfs,srijeyanthan/hops,tempbottle/hadoop-hdfs,gigaroby/hops,hopshadoop/hops,robzor92/hops,tempbottle/hadoop-hdfs,tempbottle/hadoop-hdfs,srijeyanthan/hops,hopshadoop/hops,hopshadoop/hops,gabrielborgesmagalhaes/hadoop-hdfs,smkniazi/hops,srijeyanthan/hops,robzor92/hops,tempbottle/hadoop-hdfs,srijeyanthan/hops,robzor92/hops,steveloughran/hadoop-hdfs,hopshadoop/hops,srijeyanthan/hops,srijeyanthan/hops,steveloughran/hadoop-hdfs,robzor92/hops,tempbottle/hadoop-hdfs,robzor92/hops,smkniazi/hops,gigaroby/hops,gabrielborgesmagalhaes/hadoop-hdfs,robzor92/hops,gabrielborgesmagalhaes/hadoop-hdfs,smkniazi/hops,gigaroby/hops,hopshadoop/hops,steveloughran/hadoop-hdfs,smkniazi/hops,gigaroby/hops,hopshadoop/hops,steveloughran/hadoop-hdfs,smkniazi/hops,gabrielborgesmagalhaes/hadoop-hdfs,gigaroby/hops