Rework vsock test

We mainly provide VsockAddr, so let's try to test well that VsockAddr
mapping to libc::sockaddr_vm is correct.

Let's remove all interactions with the socket, since vsock may or may
not be available in the environment.
Testing socket(), bind(), listen(), connect(), etc. caused unexpected
failures, and it's out of scope of this crate.

So let's simplify the vsock test focussing on VsockAddr.
This should work also on graviton, so let's try to re-enable it.

Fixes #1934

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

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