Prevent `pylint` import errors on `six.moves`

`six.moves` is a dynamically-created namespace that doesn't actually
exist and therefore `pylint` can't statically analyze it.

By default, `pylint` is smart enough to realize that and ignore the
import errors.

However, because we vendor it, the location changes to
`kafka.vendor.six.moves` so `pylint` doesn't realize it should be
ignored.

So this explicitly ignores it.

`pylint` documentation of this feature:
http://pylint.pycqa.org/en/1.9/technical_reference/features.html?highlight=ignored-modules#id34

More background:
* https://github.com/PyCQA/pylint/issues/1640
* https://github.com/PyCQA/pylint/issues/223

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