HIVE-5031: [WebHCat] GET job/:jobid to return userargs for a job in addtion to status information (Daniel Dai via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1526749 13f79535-47bb-0310-9956-ffa450edef68