MAPREDUCE-5213. Re-assess TokenCache methods marked @Private. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506758 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9701. mvn site ambiguous links in hadoop-common. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506762 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd