Remove exception for onion peers

Like clearnet peers, they are only returned in server.peers.subscribe
if there was a successful connection.

docs/PEER_DISCOVERY.rst

@@ -53,13 +53,8 @@ The server should craft its response in a way that reduces the
 effectiveness of sybil attacks and peer spamming.
 
 The response should only include peers it has successfully connected
-to recently.  If Tor routing is not available, so their existence
-cannot be verified, the response should include some hard-coded onion
-peers so that clients always have a choice of onion servers.
-
-Only reporting recent good peers ensures that those that have gone
-offline will not be passed around for long (ignoring for hard-coded
-onion peer exception).
+to recently.  Only reporting recent good peers ensures that those that
+have gone offline will not be passed around for long.
 
 In ElectrumX, "recently" is taken to be the last 24 hours.  Only one
 peer from each IPv4/16 netmask is returned, and the number of onion

server/peers.py

@@ -259,7 +259,6 @@ class PeerManager(util.LoggedClass):
         # IP address that was connected to.  Adding a peer will evict
         # any other peers with the same host name or IP address.
         self.peers = set()
-        self.onion_peers = []
         self.permit_onion_peer_time = time.time()
         self.proxy = SocksProxy(env.tor_proxy_host, env.tor_proxy_port,
                                 loop=self.loop)
@@ -417,7 +416,6 @@ class PeerManager(util.LoggedClass):
             peers.update(bucket_peers[:2])
 
         # Add up to 20% onion peers (but up to 10 is OK anyway)
-        onion_peers = onion_peers or self.onion_peers
         random.shuffle(onion_peers)
         max_onion = 50 if is_tor else max(10, len(peers) // 4)
 
@@ -460,8 +458,6 @@ class PeerManager(util.LoggedClass):
         '''Import hard-coded peers from a file or the coin defaults.'''
         self.add_peers(self.myselves)
         coin_peers = self.env.coin.PEERS
-        self.onion_peers = [Peer.from_real_name(rn, 'coins.py')
-                            for rn in coin_peers if '.onion ' in rn]
 
         # If we don't have many peers in the peers file, add
         # hard-coded ones