Skip import test for _odict_py2
Skip import test for _odict_py2

See https://github.com/spacetelescope/pyasdf/issues/187 for a discussion
of why _odict_py2 does not end up being included in python 3 source
packages in asdf.

astropy/conda-build-tools,astropy/conda-builder-affiliated,astropy/conda-builder-affiliated,astropy/conda-build-tools