py3kcompat: remove
py3kcompat: remove

Everything is already in six>=1.4.0 and we already depend on such a
version. There's no reason to keep this file.

Change-Id: I06b90f789ae21f2ef8b8071b4298bfc0406482a6

varunarya10/oslo.utils,dims/oslo.utils,openstack/oslo.utils,magic0704/oslo.utils