vz mode now prints WARN[0001] vmType vz: ignoring [TimeZone] on every start up

[AkihiroSuda]

vz mode now prints WARN[0001] vmType vz: ignoring [TimeZone] on every start up

Originally posted by @AkihiroSuda in #2097 (comment)

[jandubois]

I've created #2106 with the obvious fix, but I feel like this knownYamlProperties mechanism is not the right way to deal with these things.

Especially since this is a lie: the VZ driver knows nothing about this property at all; it is just something passed through to cloud-init and doesn't need any driver support.

It is not super important, but this should probably be refactored somehow into the limayaml package, and maybe only properties requiring additional driver support should be marked up especially.