net/tstun: add better logging of natV4Config

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It might as well have been spewing out gibberish. This adds
a nicer output format for us to be able to read and identify
whats going on.

Sample output
```
natV4Config{nativeAddr: 100.83.114.95, listenAddrs: [10.32.80.33], dstMasqAddrs: [10.32.80.33: 407 peers]}
```

Fixes tailscale/corp#14650

Signed-off-by: Maisem Ali <maisem@tailscale.com>

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