[SPARK-15072][SQL][PYSPARK][HOT-FIX] Remove SparkSession.withHiveSupport from readwrite.py

## What changes were proposed in this pull request?
Seems https://github.com/apache/spark/commit/db573fc743d12446dd0421fb45d00c2f541eaf9a did not remove withHiveSupport from readwrite.py

Author: Yin Huai <yhuai@databricks.com>

Closes #13069 from yhuai/fixPython.

python/pyspark/sql/readwriter.py

@@ -875,7 +875,7 @@ def _test():
     globs = pyspark.sql.readwriter.__dict__.copy()
     sc = SparkContext('local[4]', 'PythonTest')
     try:
-        spark = SparkSession.withHiveSupport(sc)
+        spark = SparkSession.builder.enableHiveSupport().getOrCreate()
     except py4j.protocol.Py4JError:
         spark = SparkSession(sc)