Fix tests

broker/src/asapo_broker/database/mongodb.go

broker/src/asapo_broker/database/mongodb_streams.go

broker/src/asapo_broker/server/get_streams.go

producer/api/cpp/src/producer_impl.cpp

producer/api/cpp/unittests/test_producer_impl.cpp

tests/automatic/producer/c_api/producer_api.c