Preparing to release hadoop-2.4.1.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1602888 13f79535-47bb-0310-9956-ffa450edef68
Preparing to release hadoop-2.4.1.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4.1@1602894 13f79535-47bb-0310-9956-ffa450edef68
Set version in branch-2.4.1 to 2.4.1.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4.1@1602896 13f79535-47bb-0310-9956-ffa450edef68
Apache Hadoop 2.4.1 release.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/tags/release-2.4.1-rc0@1602897 13f79535-47bb-0310-9956-ffa450edef68
Merge tag 'release-2.4.1-rc0' into branch-2.4.1-alti

release-2.4.1-rc0