pandas.util.testing no longer imported with pandas
0.25.3

```python
In [1]: import pandas

In [2]: pandas.util.testing
Out[2]: <module 'pandas.util.testing' from '/private/tmp/pandas/util/testing.py'>
```

1.0

```python
In [1]: import pandas

In [2]: pandas.util.testing
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-2-968e027d039f> in <module>
----> 1 pandas.util.testing

AttributeError: module 'pandas.util' has no attribute 'testing'
```