go/neo/proto: AddrString: Also treat lonet networks as having addr in host:port form

Without that, when lonet will be used in tests, port won't be correctly
extracted from an address.

go/neo/proto/proto-misc.go

-// Copyright (C) 2017-2018  Nexedi SA and Contributors.
+// Copyright (C) 2017-2021  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -157,6 +157,7 @@ func AddrString(network, addr string) (Address, error) {
 	case strings.HasPrefix(network, "tcp"):
 	case strings.HasPrefix(network, "udp"):
 	case strings.HasPrefix(network, "pipe"):
+	case strings.HasPrefix(network, "lonet"):
 	}
 
 	host, portstr, err := net.SplitHostPort(addr)