HostResolver shouldn't return IPv6 addresses by default

[jandubois]

They don't work over the SLIRP interface, and sometimes don't even work over a bridged vmnet interface.

See also rancher-sandbox/rancher-desktop#1193

This PR deprecates the useHostResolver setting and replaces it with hostResolver.enabled. The old setting can still be used, but if the new property is set, any old setting in the same file is being ignored. Generating proper warnings gets pretty complex when the interaction between default.yaml, lima.yaml, and override.yaml have to be considered.

It could be argued that HostResolver.LookupIPv6 should default to true for compatibility with previous releases. However, given that it seems to be broken in some setups, disabling IPv6 by default seems like a safer choice to me.

Also includes one bug fix for limactl debug dns 5533 5533, which previously ignored the TCP port.

Aside: I needed to include the TCP port during testing because limactl debug dns 5533 (without -6) option resulted in:

$ dig @127.0.0.1 -p 5533 AAAA google.com
;; Truncated, retrying in TCP mode.
;; Connection to 127.0.0.1#5533(127.0.0.1) for google.com failed: connection refused.

[AkihiroSuda]

Thanks