Preparing for hadoop-2.1.1-beta release.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523890 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9350. Moving to appropriate section in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523891 13f79535-47bb-0310-9956-ffa450edef68
Added ASL2 header to releasenotes.html.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523900 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-261-trunk-gd