Add support for Windows files and services to TestInfra

[fatal-exception]

This PR, which also contains changes in https://github.com/philpep/testinfra/pull/480 which we needed to get testinfra to work on windows, adds support for Windows files and services, allowing tests to be written against these objects.

I was having trouble running the tests (they seem to require a French locale), so I'm hoping Travis will check this PR

[opendev-zuul[bot]]

Build succeeded (third-party-check pipeline).

• system-config-run-base-ansible-devel : SUCCESS in 16m 32s

[opendev-zuul[bot]]

Build succeeded (third-party-check pipeline).

• system-config-run-base-ansible-devel : SUCCESS in 17m 04s

[keachi]

@fatal-exception @philpep What is the status with this PR?

[tdas3001]

@fatal-exception @philpep any progress on the PR?

[philpep]

@tdas3001 I've no time and no knowledge to review or maintain this. So unless there's a new maintainer able to handle it, windows support will remain minimal.