HIVE-5941 : SQL std auth - support 'show roles' (Navis via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1558252 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6161 : Fix TCLIService duplicate thrift definition for TColumn (Jay Bennett via Navis)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1558269 13f79535-47bb-0310-9956-ffa450edef68