more work at streams

common/cpp/src/system_io/system_io.cpp

receiver/src/request_handler_authorize.cpp

receiver/src/request_handler_db.cpp

receiver/unittests/test_request_handler_authorizer.cpp

receiver/unittests/test_request_handler_db.cpp

receiver/unittests/test_request_handler_db_meta_writer.cpp

receiver/unittests/test_request_handler_db_writer.cpp

worker/api/cpp/src/server_data_broker.cpp