Initialize streamhandler early to have it apply to all logs

tests/test_configuration.py

@@ -21,7 +21,7 @@ from freqtrade.configuration.deprecated_settings import (
 from freqtrade.configuration.load_config import load_config_file, log_config_error_range
 from freqtrade.constants import DEFAULT_DB_DRYRUN_URL, DEFAULT_DB_PROD_URL
 from freqtrade.exceptions import OperationalException
-from freqtrade.loggers import _set_loggers, setup_logging
+from freqtrade.loggers import _set_loggers, setup_logging, setup_logging_pre
 from freqtrade.state import RunMode
 from tests.conftest import (log_has, log_has_re,
                             patched_configuration_load_config_file)
@@ -674,6 +674,7 @@ def test_set_loggers_syslog(mocker):
               'logfile': 'syslog:/dev/log',
               }
 
+    setup_logging_pre()
     setup_logging(config)
     assert len(logger.handlers) == 3
     assert [x for x in logger.handlers if type(x) == logging.handlers.SysLogHandler]