Update testinfra to 6.0.0

[pyup-bot]

This PR updates testinfra from 3.4.0 to 6.0.0.

Changelog

6.0.0

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* Breaking change: testinfra has moved to the https://github.com/pytest-dev/
organization. Project on PyPi is renamed as pytest-testinfra. A dummy
testinfra will make the transition, but you should rename to pytest-testinfra
in your requirements files.

5.3.1

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* Fix newly introduced is_masked property on systemd service https://github.com/philpep/testinfra/pull/569

5.3.0

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* Add is_masked property on systemd service

5.2.2

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* iptables: use -w option to wait for iptables lock when running in parallel
with pytest-xdist.

5.2.1

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* Fix documentation build

5.2.0

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* Allow kubeconfig context to be supplied in kubernetes backend
* Drop file.__ne__ implementation and require python >= 3.5

5.1.0

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* Use remote_user and remote_port in ansible.cfg
* Add `arch` (architecture) attribute to system_info module

5.0.0

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* Breaking change:  host.file().listdir() is now a method

4.1.0

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* Pass extra arguments to ansible CLI via host.ansible()
* New method host.file.listdir() to list items in a directory.

4.0.0

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* Drop python2 support

Links

• PyPI: https://pypi.org/project/testinfra
• Changelog: https://pyup.io/changelogs/testinfra/
• Repo: https://github.com/philpep/testinfra