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This adds tests for DNS requests, and ignoring IPv6 packets on v4-only networks. No behavior changes. But some things are pulled out into functions. And the mkPacket helpers previously just for tests are moved into non-test code to be used elsewhere to reduce duplication, doing the checksum stuff automatically. Updates #13038 Change-Id: I4dd0b73c75b2b9567b4be3f05a2792999d83f6a3 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>