HDFS-5860. Refactor INodeDirectory getDirectoryXFeature methods to use common getFeature helper method. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4685@1563374 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5861. Add CLI test for Ls output for extended ACL marker. Contributed by Vinay.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4685@1563375 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'HDFS-4685' into HDFS-5616