inspect with network=none show SandboxKey netns path

[Luap99]

We do not use any special netns path for the netns=none case, however callers that inspect that may still wish to join the netns path directly without extra work to figure out /proc/$pid/ns/net.

Fixes #16716

Does this PR introduce a user-facing change?

podman inspect will now show a `.NetworkSettings.SandboxKey` path for containers created with --net=none. 

[vrothberg]

LGTM

[openshift-ci]

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[vrothberg]

@containers/podman-maintainers PTAL

I restarted the flaked job. @edsantiago, I think my new sdnotify: healthy test is flaking. Does it show up in your data?

[edsantiago]

@vrothberg I don't see or remember any new sdnotify flakes, but will look at this one shortly.

[rhatdan]

/lgtm

[RushingAlien]

Hello, This seems to not have landed to any stable/point releases?

I was checking on tagged releases to see if this commit is available, but i do not see it

[vrothberg]

It landed in 4.7 (see the indication in the commit ada7188).