[SPARK-8511][pyspark] Modify a test to remove a saved model in `regression.py`#6926

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Commits on Jun 21, 2015

[SPARK-8511][pyspark] Modify a test to remove a saved model in `regression.py`
yu-iskw
committed
Use `shutil.rmtree()` to temporary directories for saving model testings, instead of `os.removedirs()`
yu-iskw
committed