Bring all data sources to a format that enables add/remove decisions

[johanix]

When a domain name shows up it should possibly be added to the resulting RPZ. This decison depends on what data we have on this name in other available sources.

• Grey names: Typically we want to correlate a new grey name to other grey data and then filter the result against any white data. Black lists not involved

• Black names: only filter against white data.

• White names: these are interesting. Should it be possible to send a single white name as "intel" with the expectation that this would clean out that name from the output RPZ plus add the name to a local whitelist? Yes, I think that's reasonable.

• RPZ whitelist source: suck it in, parse contents and toss anything that isn't "rpz-passthru". Store rest in a reasonably efficient data structure (eg. a map[string]bool).

• RPZ blacklist: suck it in, parse contents and send any "rpz-passthru." actions to the local in-memory whitelist. Everything else goes into an in-memory blacklist of just names, no actions).

• RPZ greylist: suck it in, parse it. Send all "rpz-passthru." actions into the in-memory whitelist. Send everything else (just names, not actions) into a local in-memory greylist for that source.