HDFS-5556. Add some more NameNode cache statistics, cache pool stats (cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1546143 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5545. Allow specifying endpoints for listeners in HttpServer. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1546151 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk