Updated release notes for hadoop-2.4.1 rc1.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604314 13f79535-47bb-0310-9956-ffa450edef68
YARN-2187. FairScheduler: Disable max-AM-share check by default. (Robert Kanter via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604321 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4667. Capture renamed files/directories in snapshot diff report. Contributed by Jing Zhao and Binglin Chang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604488 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6583. Remove clientNode in FileUnderConstructionFeature. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604541 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6507. Improve DFSAdmin to support HA cluster better. (Contributd by Zesheng Wu)

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HDFS-6580. FSNamesystem.mkdirsInt should call the getAuditFileInfo() wrapper. Contributed bu Zhilei Xu.

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HDFS-6587. Bug in TestBPOfferService can cause test failure. (Contributed by Zhilei Xu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604899 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6578. add toString method to DatanodeStorage for easier debugging. (Contributed by Yongjun Zhang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604942 13f79535-47bb-0310-9956-ffa450edef68
YARN-2191. Added a new test to ensure NM will clean up completed applications in the case of RM restart. Contributed by Wangda Tan

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604949 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10659. Refactor AccessControlList to reuse utility functions and to improve performance. (Contributed by Benoy Antony)

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