fixes #7244

Sometimes IPNS publishes can take longer than a minute. Since DHT lookups now terminate without needing to query a huge portion of the network (even if the lookups take a while until more of the network upgrades to v0.5.0+), we should allow the user's IPNS queries to go on until they're ready to cancel them.

Note: There's still a 30 second timeout on doing a record Get before Publishing, however this doesn't bother me too much since it both doesn't cause an error to be returned and the whole code path is a bit strange in general since it seems to only get called if either:

1. The IPNS key is first being used (in which case we expect the Get to return no info, so we might as well have a timeout)
2. The datastore (not the blocks section, but the rest of the datastore) has been cleaned out/restored from a backup (not really supported)
3. The IPNS key is being added to a new machine (also not supported)