Pytest-testinfra

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* Fix running testinfra within a suite using doctest (268)
* Service: add is_valid method for systemd
* Fix file.linked_to() for Mac OS

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* Interface: allow to find 'ip' command ousite of PATH
* Fix --nagios option with python 3

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* Deprecate testinfra command (will be dropped in 2.0), use py.test instead 135
* Handle --nagios option when using py.test command

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* Support for ansible 2.4 (249)

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* Salt: allow specify config directory (230)
* Add a WinRM backend
* Socket: ipv6 sockets can handle ipv4 clients (234)
* Service: Enhance upstart detection (243)

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* Service: add is_enabled() support for OpenBSD
* Add ssh identity file option for paramiko and ssh backends
* Expand tilde (~) to user home directory for ssh-config, ssh-identity-file and
ansible-inventory options