HDFS-6570. add api that enables checking if a user has certain permissions on a file. Contributed by Jitendra Pandey.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1614723 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10756. KMS audit log should consolidate successful similar requests. (asuresh via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1614725 13f79535-47bb-0310-9956-ffa450edef68