[Chilli] uamdomain / uamallowed

[David Bird]

In an effort to make uamdomain a bit more flexible, a change is
required. Right now, DNS queries ending in any uamdomain defined are
added to the garden when resolved. This means it's always "*uamdomain"
in the match. Instead, maybe the "*" should have to be explicitly, as in
"uamdomain=*.domain.com" so that you can also do single hostnames such
as "uamdomain=singlehost.domain.com". ? 

Or, uamdomain could be kept as-is (and via an option) hostnames in
uamallowed can be "re-checked" against DNS to pick up any round-robin
(or just new) IP addresses to add to garden ?  This way, the syntax for
uamdomain does not need to change and hostnames used in uamallowed will
update the walled garden when those hostnames are resolved by users (and
not just resolved on start-up). 

Thoughts?