[SPARK-5429][SQL] Use javaXML plan serialization for Hive golden answers on Hive 0.13.1

I found that running `HiveComparisonTest.createQueryTest` to generate Hive golden answer files on Hive 0.13.1 would throw KryoException. I am not sure if this can be reproduced by others. Since Hive 0.13.0, Kryo plan serialization is introduced to replace javaXML as default plan serialization format. This is a quick fix to set hive configuration to use javaXML serialization.

Author: Liang-Chi Hsieh <viirya@gmail.com>

Closes #4223 from viirya/fix_hivetest and squashes the following commits:

97a8760 [Liang-Chi Hsieh] Use javaXML plan serialization.

sql/hive/src/main/scala/org/apache/spark/sql/hive/TestHive.scala

@@ -68,6 +68,8 @@ class TestHiveContext(sc: SparkContext) extends HiveContext(sc) {
   System.clearProperty("spark.hostPort")
   CommandProcessorFactory.clean(hiveconf)
 
+  hiveconf.set("hive.plan.serialization.format", "javaXML")
+
   lazy val warehousePath = getTempFilePath("sparkHiveWarehouse").getCanonicalPath
   lazy val metastorePath = getTempFilePath("sparkHiveMetastore").getCanonicalPath