HIVE-7930: enable vectorization_short_regress.q, vector_string_concat.q [Spark Branch] (Chinna via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1635778 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'upstream/spark' into spark