HADOOP-9557. Merging change r1523186 from branch-2 to branch-2.1-beta

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1523187 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9350. Hadoop not building against Java7 on OSX: now applied across branch-2.1, 2 and trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1523190 13f79535-47bb-0310-9956-ffa450edef68