Add fallback for busybox hostname with wsl2

[afbjorklund]

Fix the hostname command, instead of switching to the built-in port forwarding.

Problem is that every WSL distribution will otherwise report the IP as 127.0.0.1:22.

Reverts:

• Use loopback for SSH connection in WSL2 #3299

Fixes:

• [WSL2] getWslSSHAddress would fail on busybox distros #3242

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https://learn.microsoft.com/en-us/windows/wsl/networking

Note that hostname -i returns 127.0.1.1, on Ubuntu/Alpine

[afbjorklund]

We don't actually have any rootfs images based on Alpine, but it can be tested in a docker container I suppose.

docker run -it ubuntu bash -c "hostname -I | cut -d ' ' -f1"

docker run -it alpine sh -c "ip route get 1 | awk '{gsub(\"^.*src \",\"\"); print $1; exit}'"

Unfortunately WSL doesn't provide any sane method, to query the IP of the "distro" from the outside (host)...

https://learn.microsoft.com/en-us/windows/wsl/networking

Compare: docker inspect --format='{{ .NetworkSettings.IPAddress }}'

[AkihiroSuda]

Thanks