95bde34a71
6866259fabd8580c92693703d80773428aca8175 net: Hardcoded seeds update for 0.21 (Wladimir J. van der Laan)
36e875b4c5f0812868e34beba7be4aa1f7a00773 contrib: Add new versions to makeseeds.py and update gitignore (RandyMcMillan)
Pull request description:
Stats:
```
IPv4 IPv6 Onion Pass
426728 59523 7900 Initial
426728 59523 7900 Skip entries with invalid address
426728 59523 7900 After removing duplicates
426727 59523 7900 Skip entries from suspicious hosts
123226 51785 7787 Enforce minimal number of blocks
121710 51322 7586 Require service bit 1
4706 1427 3749 Require minimum uptime
4124 1098 3681 Require a known and recent user agent
4033 1075 3681 Filter out hosts with multiple bitcoin ports
512 140 512 Look up ASNs and limit results per ASN and per net
```
I've credited RandyMcMillan for the first commit because of #20190.
There are at least enough onions this time! Number of IPv6 nodes that pass all the requirements seems similar to last time in #18506.
For the next major release we'll want TORv3 hardcoded peers as well. This makes no sense now as there are hardly any. But it'd make sense to think about how to collect them because they cannot come from the DNS seeds.
### Reviewing
```
2020-10-28 12:04:45 jnewbery wumpus: Do you have any suggestions for how to review #20237 ?
2020-10-28 12:28:37 wumpus jnewbery: previous PRs like it might be a guide there (#18506, #16999), e.g. people could try to repeat the last step in https://github.com/bitcoin/bitcoin/tree/master/contrib/seeds#seeds and see if it ends up with the same .h file, you could also repeat the entire process but as the list of peers from the seeder will be different every time that will give a (slightly, hopefully)
2020-10-28 12:28:37 wumpus different output
2020-10-28 12:49:40 wumpus testing what part of the peers are connectable is also useful
2020-10-28 12:51:05 wumpus or to go deeper, whether most part of the nodes are 'good nodes' and not say spy nodes, but i don't know what means of testing
```
ACKs for top commit:
jonatack:
ACK 6866259fabd8580c92693703d80773428aca8175
Tree-SHA512: 6b913ec92932de03304301a0cbf7b4a912ed09d890b019deeb449b8fa787c4994222368c6bf08b3c6e2bfa474442612e1c9de9327ec46ba59c37a5f38af50c75
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