makeseeds: Shuffle ips after parsing

The crawlers are not guaranteed to output nodes in a random order, so
shuffle the ips list after parsing to break any biasing that may be
caused by the output order.

contrib/seeds/makeseeds.py

@@ -10,6 +10,7 @@ import argparse
 import collections
 import ipaddress
 from pathlib import Path
+import random
 import re
 import sys
 from typing import Union
@@ -211,6 +212,7 @@ def main():
     with open(args.seeds, 'r', encoding='utf8') as f:
         lines = f.readlines()
     ips = [parseline(line) for line in lines]
+    random.shuffle(ips)
     print('Done.', file=sys.stderr)
 
     print('\x1b[7m  IPv4   IPv6  Onion  I2P    CJDNS Pass                                               \x1b[0m', file=sys.stderr)