Update CHANGES.txt for commit of YARN-4348 to branch-2.7 and branch-2.6.
Update CHANGES.txt for commit of YARN-4348 to branch-2.7 and branch-2.6.

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