HIVE-8830 : hcatalog process don't exit because of non daemon thread (Thejas Nair, reviewed by Eugene Koifman, Sushanth Sowmyan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1639797 13f79535-47bb-0310-9956-ffa450edef68