HIVE-5120 : document what hive.server2.thrift.sasl.qop values mean in hive-default.xml.template (Thejas Nair via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1515837 13f79535-47bb-0310-9956-ffa450edef68