Testinfra

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* Add support for ansible lxc and lxd connections

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* Fix paramiko parsing RequestTTY from ssh configs
* Re-add "groups" key from ansible.get_variables() to be backward compatible
with testinfra 2.X

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* Fix ansible with no inventory resolving to "localhost"
* Fix support for ansible 2.8 with no inventory
* Fix ansible/paramiko which wasn't reading hosts config from ~/.ssh/config
* Allow to pass --ssh-config and --ssh-identity-file to ansible connection

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* Fix parsing of ipv6 adresses for paramiko, ssh and ansible backends.
* Fix --connection=ansible invocation when no hosts are provided

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* New ansible backend fixing support for ansible 2.8 and license issue. See
https://github.com/philpep/testinfra/issues/431 for details. This make
ansible using testinfra native backends and only works for local, ssh or
docker connections. I you have others connection types or issues, please open
a bug on https://github.com/philpep/testinfra/issues/new
* Windows support is improved. "package" module is handled with Chocolatey and
there's support for the "user" module.

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* docker: new get_containers() classmethod
* socket: fix parsing of ipv6 addresses with new versions of ss
* service: systemd fallback to sysv when "systemctl is-active" is not working