Increase relays to compensate for smaller guard fraction

Since the guard percentage has been reduced from 50% to 25% of relays,
we need more relays to compensate. This patch uses 8 relays, ensuring
at least 2 guards on all known tor versions.

networks/basic

@@ -2,6 +2,6 @@ Authority = Node(tag="a", authority=1, relay=1, torrc="authority.tmpl")
 Relay = Node(tag="r", relay=1, torrc="relay.tmpl")
 Client = Node(tag="c", torrc="client.tmpl")
 
-NODES = Authority.getN(3) + Relay.getN(5) + Client.getN(2)
+NODES = Authority.getN(3) + Relay.getN(8) + Client.getN(2)
 
 ConfigureNodes(NODES)