HIVE-7846 : authorization api should support group, not assume case insensitive role names (Thejas Nair, reviewed by Jason Dere)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1621399 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7895 : Storage based authorization should consider sticky bit for drop actions (Thejas Nair, reviewed by Jason Dere)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1621400 13f79535-47bb-0310-9956-ffa450edef68