Set default port according to network

The idea is to have different default ports for different networks.

Current default port is `9735` for everything. Let's use it for
the mainnet and reuse the difference added to the default port
from `rpc_port` values in `bitcoin/chainstate.c`.

Testnet would be `19735` (adding rpc_port - 8332 = `10000`).

Signet would be `39735` (adding rpc_port - 8332 = `30000`).

Regtest would be `19846` (adding rpc_port - 8332 = `10111`).

With Vincenzo's kind pair-programming help over tmate.

Two other commits were squashed into this one so that bisecting
never ends up in half-baked state:

1. chainparams: Fix regtest default rpc_port

   bitcoind -help says this:

    -rpcport=<port>
         Listen for JSON-RPC connections on <port> (default: 8332, testnet:
         18332, signet: 38332, regtest: 18443)

2. test_gossip: Default port for regtest

   hex: 2607 is now .... (could be 4d86 but Elements uses another port)
   dec: 9735 is now any port (could be 19846 ^^ but now is for any port)

   The lines which were binding to default port were removed as the
   default port is different on each network.

NOTE: Remember not to modify gossip_store tests which loads everything raw
      including the checksums.

Changelog-Changed: If the port is unspecified, the default port is chosen according to used network similarly to Bitcoin Core.

bitcoin/chainparams.c

@@ -63,7 +63,7 @@ const struct chainparams networks[] = {
 				      0x5b, 0xbf, 0x28, 0xc3, 0x4f, 0x3a, 0x5e,
 				      0x33, 0x2a, 0x1f, 0xc7, 0xb2, 0xb7, 0x3c,
 				      0xf1, 0x88, 0x91, 0x0f}}}},
-     .rpc_port = 18332,
+     .rpc_port = 18443,
      .cli = "bitcoin-cli",
      .cli_args = "-regtest",
      .cli_min_supported_version = 150000,

lightningd/lightningd.c

@@ -197,7 +197,6 @@ static struct lightningd *new_lightningd(const tal_t *ctx)
 	 * NULL.  So we start with a zero-length array. */
 	ld->proposed_wireaddr = tal_arr(ld, struct wireaddr_internal, 0);
 	ld->proposed_listen_announce = tal_arr(ld, enum addr_listen_announce, 0);
-	ld->portnum = DEFAULT_PORT;
 	ld->listen = true;
 	ld->autolisten = true;
 	ld->reconnect = true;
@@ -952,6 +951,10 @@ int main(int argc, char *argv[])
 	 * non-early opts.  This also forks if they say --daemon. */
 	handle_early_opts(ld, argc, argv);
 
+	/*~ Set the default portnum according to the used network
+	 * similarly to what Bitcoin Core does to ports by default. */
+	ld->portnum = DEFAULT_PORT + chainparams->rpc_port - 8332;
+
 	/*~ Initialize all the plugins we just registered, so they can
 	 *  do their thing and tell us about themselves (including
 	 *  options registration). */

tests/test_gossip.py

@@ -139,8 +139,8 @@ def test_announce_address(node_factory, bitcoind):
         l1.daemon.wait_for_log(r"\[OUT\] 0101.*47"
                                "010102030404d2"
                                "017f000001...."
-                               "02000000000000000000000000000000002607"
-                               "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba50230032607")
+                               "0200000000000000000000000000000000...."
+                               "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba5023003....")
         return
 
     # We should see it send node announce with all addresses (257 = 0x0101)
@@ -154,8 +154,8 @@ def test_announce_address(node_factory, bitcoind):
     l1.daemon.wait_for_log(r"\[OUT\] 0101.*0063"
                            "010102030404d2"  # IPv4 01 1.2.3.4:1234
                            "017f000001...."  # IPv4 01 127.0.0.1:wxyz
-                           "02000000000000000000000000000000002607"  # IPv6 02 :::9735
-                           "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba50230032607"  # TORv3 04
+                           "0200000000000000000000000000000000...."  # IPv6 02 :::<any_port>
+                           "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba5023003...."  # TORv3 04
                            "05096c6f63616c686f737404d3"       # DNS 05 len localhost:1235
                            "050b6578616d706c652e636f6d04d4")  # DNS 05 len example.com:1236
 
@@ -1018,10 +1018,7 @@ def test_gossip_addresses(node_factory, bitcoind):
     l1 = node_factory.get_node(options={
         'announce-addr': [
             '[::]:3',
-            '[::]',
             '127.0.0.1:2',
-            '127.0.0.1',
-            'vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd.onion',
             '4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion:1234'
         ],
     })
@@ -1036,10 +1033,7 @@ def test_gossip_addresses(node_factory, bitcoind):
     nodes = l2.rpc.listnodes(l1.info['id'])['nodes']
     assert len(nodes) == 1 and nodes[0]['addresses'] == [
         {'type': 'ipv4', 'address': '127.0.0.1', 'port': 2},
-        {'type': 'ipv4', 'address': '127.0.0.1', 'port': 9735},
         {'type': 'ipv6', 'address': '::', 'port': 3},
-        {'type': 'ipv6', 'address': '::', 'port': 9735},
-        {'type': 'torv3', 'address': 'vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd.onion', 'port': 9735},
         {'type': 'torv3', 'address': '4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion', 'port': 1234},
     ]
 
@@ -1911,7 +1905,7 @@ def test_statictor_onions(node_factory):
     })
 
     assert l1.daemon.is_in_log('127.0.0.1:{}'.format(l1.port))
-    assert l2.daemon.is_in_log('x2y4zvh4fn5q3eouuh7nxnc7zeawrqoutljrup2xjtiyxgx3emgkemad.onion:9735,127.0.0.1:{}'.format(l2.port))
+    assert l2.daemon.is_in_log('x2y4zvh4fn5q3eouuh7nxnc7zeawrqoutljrup2xjtiyxgx3emgkemad.onion:{},127.0.0.1:{}'.format(l2.port, l2.port))
 
 
 @pytest.mark.developer("needs a running Tor service instance at port 9151 or 9051")