HDFS-4860. Add additional attributes to JMX beans. Contributed by Trevor Lorimer

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1500139 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8844. Add a plaintext fs -text test-case. Contributed by Akira AJISAKA. (harsh)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1500190 13f79535-47bb-0310-9956-ffa450edef68