DRILL-1024: Move hive storage code out of 'exec/java-exec' into 'contrib/storage-hive' module.

+ Create two modules in contrib/storage-hive
  ++ contrib/storage-hive/hive-exec-shade: creates shaded hive-exec.jar
  ++ contrib/storage-hive/core: contains Hive storage code (schema, record reader and functions)
+ Update TestHiveUDFs.java to use BaseTestQuery instead of SimpleRootExec