HDFS-6028. Print clearer error message when user attempts to delete required mask entry from ACL. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1572753 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10374. InterfaceAudience annotations should have RetentionPolicy.RUNTIME. (Contributed by Enis Soztutar)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1572783 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5665. Add audience annotations to MiniMRYarnCluster and MiniMRCluster. (Anubhav Dhoot via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1572795 13f79535-47bb-0310-9956-ffa450edef68