svn merge -c 1618659 FIXES: HADOOP-10059. RPC authentication and authorization metrics overflow to negative values on busy clusters. Contributed by Tsuyoshi OZAWA and Akira AJISAKA


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618661 13f79535-47bb-0310-9956-ffa450edef68