HIVE-5078: [WebHCat] Fix e2e tests on Windows plus test cases for new features (Daniel Dai via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1526795 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5352: cast(1.0 as int) returns null (Gunther Hagleitner via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1526798 13f79535-47bb-0310-9956-ffa450edef68