[PARKED] RIP dir lookup

[vyzo]

As planned when we originally introduced DHT lookups, we can now retire directory lookups in mcnode.

[parkan]

Hmm I'm not sure we've definitively decided to do this, I can still see directories being useful for certain scenarios.

[vyzo]

Oh, we are not ditching directories altogether, and we still publish peer info when we register for non-dht clients to discover us. This just prunes the directory lookup in concat in favor of using the DHT.

[parkan]

let's sleep on this one

[vyzo]

There are some arguments for keeping the dir lookup, at least for a while longer:

• internal lookups for clusters
• aleph nodes can go public without integrating with the dht

So let's keep it parked and revisit later on.