net/portmapper: only print PCP/PMP if VerboseLogs

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Make UPnP, NAT-PMP, and PCP packet reception logs be [v1] so
they will never appear on stdout and instead only go to logtail.

```
$ tailscale netcheck
2021/10/15 22:50:31 portmap: Got PMP response; IP: w.x.y.z, epoch: 1012707
2021/10/15 22:50:31 portmap: Got PCP response: epoch: 1012707

Report:
        * UDP: true
        * IPv4: yes, w.x.y.z:1511
        * IPv6: no
        * MappingVariesByDestIP: true
        * HairPinning: false
        * PortMapping: NAT-PMP, PCP
        * Nearest DERP: San Francisco
        * DERP latency:
                - sfo: 5.9ms   (San Francisco)
                - sea: 24ms    (Seattle)
                - dfw: 45ms    (Dallas)
                - ord: 53.7ms  (Chicago)
                - nyc: 74.1ms  (New York City)
                - tok: 111.1ms (Tokyo)
                - lhr: 139.4ms (London)
                - syd: 152.7ms (Sydney)
                - fra: 153.1ms (Frankfurt)
                - sin: 182.1ms (Singapore)
                - sao: 190.1ms (S_o Paulo)
                - blr: 218.6ms (Bangalore)
```

Signed-off-by: Denton Gentry <dgentry@tailscale.com>

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