OPC-UA secondary discovery: multicast address changed to link-local
OPC-UA secondary discovery: multicast address changed to link-local

To be compatible with used systemd's socket-activation configuration

advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr