Mark additional tests requiring network

[penguinpee]

Those tests also require network and should be excluded when running
pytest -m 'not network'.

Summary for Squash and Merge

Add network pytest mark to test functions that require network connection to hit third party servers. Improve test_check_availability_invalid_downloader to remove the need to use network connection just to test an error raised after an invalid argument to a custom downloader.

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[penguinpee]

Background: In Fedora the build environment is not network enabled and downloads are prohibited during build. Yet, we like to run tests whenever possible. This allows us to simply pass -m 'no network' to pytest for running all tests that don't require network.

[penguinpee]

I marked a few more tests, which I discovered being unmarked after updating to the latest release.

[santisoler]

Thanks @penguinpee for opening this PR! Thanks for catching those unmarked test functions.

I left a few comments below, nothing major. Let me know what do you think.

BTW, don't worry about the failing test in macos. Is not your fault. I'll fix that in a separate PR.

[penguinpee]

In a nutshell, I'll make sure all plugins are present and will test again. I suppose you are right regarding the tests relying on localftpserver and httpserver. I'll update this PR according to my findings. Apologies for being a bit hasty in my conclusions.

[penguinpee]

This now works for me with httpserver and localftpserver using `-m 'not network'.

[santisoler]

Thanks for addressing my comments. And no need to apologize, the reason why these decorators shouldn't be added is subtle.

I just pushed two minor commits that move the decorators up in the list, just to improve style, nothing critical. I'm merging this.

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