fix discovery service endpoint

consumer/api/cpp/src/server_data_broker.cpp

consumer/api/cpp/unittests/test_server_broker.cpp

deploy/asapo_services/scripts/broker.json.tpl

deploy/asapo_services/scripts/receiver.json.tpl

producer/api/cpp/src/receiver_discovery_service.cpp

...cer/api/cpp/unittests/test_receiver_discovery_service.cpp

tests/automatic/settings/broker_settings.json.tpl

tests/manual/maxwell/asapo_test/clean.sh