HIVE-5309 : Update hive-default.xml.template for vectorization flag; remove unused imports from MetaStoreUtils.java (Jitendra Nath Pandey via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/vectorization@1524806 13f79535-47bb-0310-9956-ffa450edef68