HDFS-6361. TestIdUserGroup.testUserUpdateSetting failed due to out of range nfsnobody Id. Contributed by Yongjun Zhang

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595050 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5683. Better audit log messages for caching operations. Contributed by Abhiraj Butala.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595054 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6362. InvalidateBlocks is inconsistent in usage of DatanodeUuid and StorageID. (Arpit Agarwal)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595056 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6402. Suppress findbugs warning for failure to override equals and hashCode in FsAclPermission. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595070 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6345. DFS.listCacheDirectives() should allow filtering based on cache directive ID. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595086 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'apache/trunk' into archival