HADOOP-9660 [WINDOWS] Powershell / cmd parses -Dkey=value from command line as [-Dkey, value] which breaks GenericsOptionParser (enis)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1499144 13f79535-47bb-0310-9956-ffa450edef68