Zope.app.testing

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- Nothing changed yet.

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- Add support for Python 3.8, 3.9, 3.10, 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Remove ``zope.app.testing.testbrowser``. It was not compatible with
zope.testbrowser version 5.

- Add basic support for Python 3.5, 3.6 and 3.7.

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- Removed test dependency on ``zope.app.authentication``.

zope.testbrowser 4 depends on this change (seriously) if it find
zope.app.testing.

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- Move zope.app.testing testbrowser functionality into zope.app.testing. This
requires zope.testbrowser version 4.0.0 or above.

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- Include REMOTE_ADDR ('127.0.0.1') in the request environment.