wsl: usernet: Don't always bind to port 2222

[cfergeau]

podman-machine starts gvproxy without specifying -ssh-port.
This means it will always bind port 2222 (see
containers/gvisor-tap-vsock#402), effectively
bypassing the dynamic ssh port allocation.

I don't think wsl needs this port to be opened/bound on the host, but
this commit starts gvproxy with -ssh-port set to the dynamic SSH port to
avoid port conflicts with crc.
When gvproxy allows to disable this port forwarding entirely, we can
revise this.

This should fix #20327

Does this PR introduce a user-facing change?

Using podman-machine with wsl and user-mode networking will no longer result in port 2222 being always opened on the host.

[packit-as-a-service]

Ephemeral COPR build failed. @containers/packit-build please check.

[baude]

/approve

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[baude]

LGTM, @l0rd wdyt?

[jeffmaury]

If you are using the machine SSH port there I'm afraid there will be a conflict between gvproxy and win-sshproxy

[l0rd]

LGTM, @l0rd wdyt?

looking at it

[l0rd]

I confirm that, as anticipated by @jeffmaury, this unfortunately doesn't work.
Executing podman run fails with error:

> podman run hello
Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM
Error: unable to connect to Podman socket: failed to connect: ssh: handshake failed: read tcp 127.0.0.1:63020->127.0.0.1:62172: wsarecv: An existing connection was forcibly closed by the remote host.

> Get-Process -Id (Get-NetTCPConnection -LocalPort 62172).OwningProcess

 NPM(K)    PM(M)      WS(M)     CPU(s)      Id  SI ProcessName
 ------    -----      -----     ------      --  -- -----------
     17    28.04      24.77       0.34   21428   1 gvproxy
     17     2.27       8.91       0.09   20460   1 wslrelay 

[cfergeau]

The WSL podman-machine-default instance sets up its ssh server to listen on mc.SSH.Port ( https://github.com/containers/podman/blob/main/pkg/machine/wsl/stubber.go#L274-L282 ), so binding it in gvproxy as well will cause issue :-/
Let's delay this until containers/gvisor-tap-vsock#402 is implemented, then we can more easily fix this.