seeds: Pull nodes from virtu's crawler

Pull additional nodes from virtu's crawler. Data includes sufficient
Onion and I2P nodes to align the uptime requirements for these networks
to that of clearnet nodes (i.e., 50%). Data also includes more than
three times the number of CJDNS nodes currently hardcoded into
nodes_main_manual.txt, so hardcoded nodes becomes obsolete.

contrib/seeds/makeseeds.py

@@ -230,12 +230,12 @@ def main():
     # Require service bit 1.
     ips = [ip for ip in ips if (ip['service'] & 1) == 1]
     print(f'{ip_stats(ips):s} Require service bit 1', file=sys.stderr)
-    # Require at least 50% 30-day uptime for clearnet, 10% for onion and i2p.
+    # Require at least 50% 30-day uptime for clearnet, onion and i2p; 10% for cjdns
     req_uptime = {
         'ipv4': 50,
         'ipv6': 50,
-        'onion': 10,
-        'i2p' : 10,
+        'onion': 50,
+        'i2p': 50,
         'cjdns': 10,
     }
     ips = [ip for ip in ips if ip['uptime'] > req_uptime[ip['net']]]