[skeleton] Remove override_dh_python2 We do not ship files as "data files" anymore. Related to #13001466.

[skeleton] Have setuptools install data files Just add `include_package_data=True` as recommended by `setuptools documentation`_ as this appears to be the simplest way to handle this. Related to #13001466. .. _`setuptools documentation`: \ http://setuptools.readthedocs.io/en/latest/setuptools.html#including-data-files