vnet: add control/derps to test, stateful firewall

Updates #13038

Change-Id: Icd65b34c5f03498b5a7109785bb44692bce8911a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f