HIVE-5488 : some files are missing apache license headers (Thejas M Nair via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1530473 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5489 : NOTICE copyright dates are out of date, README needs update (Thejas M Nair via Carl Steinbach)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1530474 13f79535-47bb-0310-9956-ffa450edef68