Python: Compat broken for pandas==0.18.1

[asfimport]

The following failed for me with pandas==0.18.1:

In [1]: from pandas.core.dtypes import DatetimeTZDtype
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-cf9e0515688d> in <module>()
----> 1 from pandas.core.dtypes import DatetimeTZDtype

ImportError: No module named dtypes

Reporter: Uwe Korn / @xhochy
Assignee: Jeff Reback / @jreback

_{Note: This issue was originally created as ARROW-944. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Resolved in 75ebf5c