config: add peer, rpc, and rest listener options

This commit removes the `peerport` and `rpcport` config options and
adds `listen`, `rpclisten`, and `restlisten` options to allow setting
one or multiple interfaces to listen on for incoming connections.

It also adds a `nolisten` option to allow disabling the listener for
incoming peer connections.

sample-lnd.conf

@@ -36,11 +36,33 @@
 ; readonlymacaroonpath=~/.lnd/readonly.macaroon
                        
 
-; Specify the interfaces to listen on.  One listen address per line.
-; All interfaces on default port (this is the default):
-;  listen=
-; Only ipv4 localhost on port 999:
-;   listen=127.0.0.1:999
+; Specify the interfaces to listen on for p2p connections.  One listen 
+; address per line.
+; All ipv4 on port 9735:
+;   listen=0.0.0.0:9735
+; On all ipv4 interfaces on port 9735 and ipv6 localhost port 9736:
+;   listen=0.0.0.0:9735
+;   listen=[::1]:9736
+
+; Disable listening for incoming p2p connections.  This will override all 
+; listeners.
+; nolisten=1
+
+; Specify the interfaces to listen on for gRPC connections.  One listen 
+; address per line.
+; Only ipv4 localhost on port 10009:
+;   rpclisten=localhost:10009
+; On ipv4 localhost port 10009 and ipv6 port 10010:
+;   rpclisten=localhost:10009
+;   rpclisten=[::1]:10010
+
+; Specify the interfaces to listen on for REST connections.  One listen 
+; address per line.
+; All ipv4 interfaces on port 8080:
+;   restlisten=0.0.0.0:8080
+; On ipv4 localhost port 80 and 443:
+;   restlisten=localhost:80
+;   restlisten=localhost:443
 
 
 ; Adding an external IP will advertise your node to the network. This signals
@@ -63,15 +85,6 @@
 ; 65536. The profile can be access at: http://localhost:<PORT>/debug/pprof/.
 ;profile=
 
-; The port to listen on for incoming p2p connections. The default port is 9735.
-; peerport=9735
-
-; The port that the gRPC server will listen on.
-; rpcport=10009
-
-; The port that the HTTP REST proxy to the gRPC server will listen on.
-; restport=8080
-
 ; The maximum number of incoming pending channels permitted per peer.
 ; maxpendingchannels=1