Portal: use new eth/nat setupAddress

This avoids doing an unneeded portmap for TCP

Author: kdeme

portal/client/nimbus_portal_client.nim

@@ -105,10 +105,14 @@ proc run(portalClient: PortalClient, config: PortalConf) {.raises: [CatchableErr
   let
     bindIp = config.listenAddress
     udpPort = Port(config.udpPort)
-    # TODO: allow for no TCP port mapping!
-    (extIp, _, extUdpPort) = setupAddress(
-      config.nat, config.listenAddress, udpPort, udpPort, "nimbus_portal_client"
+    (extIp, extPorts) = setupAddress(
+      config.nat, config.listenAddress, @[(port: udpPort, protocol: PortProtocol.UDP)], "nimbus_portal_client"
     )
+    extUdpPort =
+      if isSome(extPorts[0]):
+        Opt.some(extPorts[0].value().port)
+      else:
+        Opt.none(Port)
     (netkey, newNetKey) =
       if config.networkKey.isSome():
         (config.networkKey.get(), true)