Machine started with Jailer and CNI but without NetNS config reports "Failed to write to tap: Os { code: 5, kind: Other, message: "I/O error" }"

When a machine is created with Jailer and CNI, but without NetNS configuration, it continually reports "Failed to write to tap: Os { code: 5, kind: Other, message: "I/O error" }"
No such problem occurs when NetNS parameter is provided.

I've noticed that the `NewMachine` function calls `jail` function, before default NetNSPath is assigned to the machine config
i.e.

jail does not configure nspath
```
if cfg.NetNS != "" {
builder = builder.WithNetNS(cfg.NetNS)
}
```

later NewMachine configures a default one
```
if cfg.NetNS == "" && cfg.NetworkInterfaces.cniInterface() != nil {
m.Cfg.NetNS = m.defaultNetNSPath()
}
```