HADOOP-9685. hadoop-config.cmd: builds a classpath that is too long on windows. Contributed by Raja Aluri.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1500829 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5371. TestProxyUserFromEnv#testProxyUserFromEnvironment failed caused by domains of windows users. Contributed by Xi Fang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1500860 13f79535-47bb-0310-9956-ffa450edef68