YARN-500. Fixed YARN webapps to not roll-over ports when explicitly asked to use non-ephemeral ports. Contributed by Kenji Kikushima.
svn merge --ignore-ancestry -c 1468739 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1468740 13f79535-47bb-0310-9956-ffa450edef68
Reverting my accidental revert of MAPREDUCE-5059 in the previous commit of YARN-500 from branch-2.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1468743 13f79535-47bb-0310-9956-ffa450edef68