HDFS-5213. TestDataNodeConfig failing on Jenkins runs due to DN web port in use. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1589474 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10251. Both NameNodes could be in STANDBY State if SNN network is unstable. Contributed by Vinayakumar B.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1589494 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6274. Cleanup javadoc warnings in HDFS code. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1589506 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6275. Fix warnings - type arguments can be inferred and redudant local variable. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1589510 13f79535-47bb-0310-9956-ffa450edef68