Feature Request: Ignore Historical Gossip Filters

[cfromknecht]

Now that https://github.com/lightningnetwork/lnd/pull/3359 has been merged, we should set --ignore-historical-filters=1 after upgrading past that commit. This prevents us from dumping our entire graph if a peer sets their filter start time super far in the past, resulting in 40+ MB of outbound bandwidth per requesting peer. On mobile this is more critical, since it can happen every time the app starts or reconnects to said peers.

[tanx]

Sweet!