Fix Unix URL handling in ssh_forwarder

[arixmkii]

Fixes #371

This platform specific handling seems not to do what it was originally intended to. See details in the original issue.

[packit-as-a-service]

We were not able to find or create Copr project packit/containers-gvisor-tap-vsock-372 specified in the config with the following error:

Packit received HTTP 500 Internal Server Error from Copr Service. Check the Copr status page: https://copr.fedorainfracloud.org/status/stats/, or ask for help in Fedora Build System matrix channel https://matrix.to/#/#buildsys:fedoraproject.org.

---

Unless the HTTP status code above is >= 500, please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[openshift-ci]

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[arixmkii]

@n1hility may be you can take a look. It came from your commit. Might be it was covering some old behavior, which is not present in the std lib anymore.

[cfergeau]

@n1hility may be you can take a look. It came from your commit. Might be it was covering some old behavior, which is not present in the std lib anymore.

I wrote a detailed answer in #371, but the TrimPrefix is required when you use an URI such as unix:///C:/foo.ext

[cfergeau]

/hold

[arixmkii]

@cfergeau Thank you! I will test in details. Converted this PR into draft and will close if it works as you described.

[arixmkii]

Was fixing the wrong part