Move HADOOP-12590 from 2.9.0 to 2.8.0 in CHANGES.txt.
Move HADOOP-12590 from 2.9.0 to 2.8.0 in CHANGES.txt.

apache/hadoop,szegedim/hadoop,bitmybytes/hadoop,apurtell/hadoop,dennishuo/hadoop,littlezhou/hadoop,JingchengDu/hadoop,979969786/hadoop,littlezhou/hadoop,legend-hua/hadoop,apurtell/hadoop,Ethanlm/hadoop,xiao-chen/hadoop,nandakumar131/hadoop,dierobotsdie/hadoop,Ethanlm/hadoop,xiao-chen/hadoop,GeLiXin/hadoop,steveloughran/hadoop,ucare-uchicago/hadoop,JingchengDu/hadoop,wenxinhe/hadoop,mapr/hadoop-common,soumabrata-chakraborty/hadoop,legend-hua/hadoop,dierobotsdie/hadoop,dierobotsdie/hadoop,apurtell/hadoop,legend-hua/hadoop,huafengw/hadoop,ronny-macmaster/hadoop,xiao-chen/hadoop,WIgor/hadoop,mapr/hadoop-common,ctrezzo/hadoop,ctrezzo/hadoop,szegedim/hadoop,wenxinhe/hadoop,soumabrata-chakraborty/hadoop,ChetnaChaudhari/hadoop,WIgor/hadoop,979969786/hadoop,wwjiang007/hadoop,steveloughran/hadoop,979969786/hadoop,bitmybytes/hadoop,xiao-chen/hadoop,ctrezzo/hadoop,ucare-uchicago/hadoop,wenxinhe/hadoop,steveloughran/hadoop,bitmybytes/hadoop,lukmajercak/hadoop,plusplusjiajia/hadoop,979969786/hadoop,steveloughran/hadoop,WIgor/hadoop,wwjiang007/hadoop,979969786/hadoop,nandakumar131/hadoop,wenxinhe/hadoop,mapr/hadoop-common,ChetnaChaudhari/hadoop,Ethanlm/hadoop,lukmajercak/hadoop,steveloughran/hadoop,mapr/hadoop-common,ucare-uchicago/hadoop,nandakumar131/hadoop,WIgor/hadoop,apache/hadoop,soumabrata-chakraborty/hadoop,legend-hua/hadoop,ctrezzo/hadoop,wenxinhe/hadoop,mapr/hadoop-common,ChetnaChaudhari/hadoop,steveloughran/hadoop,huafengw/hadoop,dierobotsdie/hadoop,ucare-uchicago/hadoop,dennishuo/hadoop,dennishuo/hadoop,apache/hadoop,JingchengDu/hadoop,bitmybytes/hadoop,xiao-chen/hadoop,huafengw/hadoop,ronny-macmaster/hadoop,wwjiang007/hadoop,lukmajercak/hadoop,apurtell/hadoop,dennishuo/hadoop,littlezhou/hadoop,plusplusjiajia/hadoop,Ethanlm/hadoop,apache/hadoop,GeLiXin/hadoop,dennishuo/hadoop,littlezhou/hadoop,lukmajercak/hadoop,bitmybytes/hadoop,huafengw/hadoop,GeLiXin/hadoop,ucare-uchicago/hadoop,ChetnaChaudhari/hadoop,littlezhou/hadoop,plusplusjiajia/hadoop,dierobotsdie/hadoop,dierobotsdie/hadoop,xiao-chen/hadoop,plusplusjiajia/hadoop,dierobotsdie/hadoop,legend-hua/hadoop,WIgor/hadoop,ucare-uchicago/hadoop,littlezhou/hadoop,GeLiXin/hadoop,lukmajercak/hadoop,soumabrata-chakraborty/hadoop,979969786/hadoop,apurtell/hadoop,ctrezzo/hadoop,apache/hadoop,szegedim/hadoop,ronny-macmaster/hadoop,ronny-macmaster/hadoop,plusplusjiajia/hadoop,wwjiang007/hadoop,nandakumar131/hadoop,ChetnaChaudhari/hadoop,steveloughran/hadoop,szegedim/hadoop,mapr/hadoop-common,Ethanlm/hadoop,legend-hua/hadoop,bitmybytes/hadoop,xiao-chen/hadoop,WIgor/hadoop,apache/hadoop,wenxinhe/hadoop,szegedim/hadoop,apurtell/hadoop,ronny-macmaster/hadoop,szegedim/hadoop,wenxinhe/hadoop,szegedim/hadoop,GeLiXin/hadoop,plusplusjiajia/hadoop,huafengw/hadoop,ronny-macmaster/hadoop,nandakumar131/hadoop,nandakumar131/hadoop,979969786/hadoop,nandakumar131/hadoop,soumabrata-chakraborty/hadoop,GeLiXin/hadoop,wwjiang007/hadoop,WIgor/hadoop,GeLiXin/hadoop,ChetnaChaudhari/hadoop,dennishuo/hadoop,ctrezzo/hadoop,legend-hua/hadoop,dennishuo/hadoop,JingchengDu/hadoop,Ethanlm/hadoop,JingchengDu/hadoop,huafengw/hadoop,plusplusjiajia/hadoop,ctrezzo/hadoop,ronny-macmaster/hadoop,JingchengDu/hadoop,ChetnaChaudhari/hadoop,littlezhou/hadoop,lukmajercak/hadoop,wwjiang007/hadoop,apache/hadoop,huafengw/hadoop,apurtell/hadoop,soumabrata-chakraborty/hadoop,soumabrata-chakraborty/hadoop,bitmybytes/hadoop,wwjiang007/hadoop,Ethanlm/hadoop,JingchengDu/hadoop,lukmajercak/hadoop,mapr/hadoop-common,ucare-uchicago/hadoop