HIVE-6793 : DDLSemanticAnalyzer.analyzeShowRoles() should use HiveAuthorizationTaskFactory (Xuefu Zhang via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1583703 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6795 : metastore initialization should add default roles with default, SBA (Thejas Nair via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1583708 13f79535-47bb-0310-9956-ffa450edef68