HIVE-6837 : HiveServer2 thrift/http mode & binary mode proxy user check fails reporting IP null for client (Vaibhav Gumashta via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1585583 13f79535-47bb-0310-9956-ffa450edef68