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