Fix IPv6 address handling in LAN <-> WAN join flooder #22226
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When `advertise_addr` is an IPv6 address, Consul WAN federation breaks
and we get a constant stream of warnings:
```
[WARN] agent.server.memberlist.wan: memberlist: Failed to resolve
i-02a3c94b46768b01f.aws-eu-west-1/2a05:d018:18a3:f202:64d9:1621:ab22:df45:8302:
lookup 2a05:d018:18a3:f202:64d9:1621:ab22:df45:8302: no such host
```
The LAN <-> WAN join flooder creates IPv6 addresses without square
brackets with `fmt.Sprintf("%s:%d", addr, s.WanJoinPort)`, which
confuses `net.SplitHostPort` in `memberlist.resolveAddr`.
Fixes hashicorp#22225
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When
advertise_addris an IPv6 address, Consul WAN federation breaks and we get a constant stream of warnings:The LAN <-> WAN join flooder creates IPv6 addresses without square brackets with
fmt.Sprintf("%s:%d", addr, s.WanJoinPort), which confusesnet.SplitHostPortinmemberlist.resolveAddr.Fixes #22225