HIVE-7878 - add -- SORT_BEFORE_DIFF to optimize_nullscan.q test (Venki Korukanti reviewed by Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1620670 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7764: Support all JDBC-HiveServer2 authentication modes on a secure cluster (Vaibhav Gumashta reviewed by Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1620689 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7885 - CLIServer.openSessionWithImpersonation logs as if it were openSession (Brock reviewed by Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1620783 13f79535-47bb-0310-9956-ffa450edef68