HIVE-8340: HiveServer2 service doesn't stop backend jvm process, which prevents follow-up service start. (Xiaobing Zhou reviewed by Vaibhav Gumashta)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1629717 13f79535-47bb-0310-9956-ffa450edef68