HIVE-7031 : Utiltites.createEmptyFile uses File.Separator instead of Path.Separator to create an empty file in HDFS (Hari Sankar via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1593647 13f79535-47bb-0310-9956-ffa450edef68