[test] Simplify logging setup

beat/core/test/__init__.py

@@ -67,13 +67,10 @@ if VERBOSE_TEST_LOGGING:
     handler = logging.StreamHandler()
     handler.setFormatter(formatter)
 
-    beat_core_logger = logging.getLogger('beat.core')
-    beat_core_logger.setLevel(logging.DEBUG)
-    beat_core_logger.addHandler(handler)
-
-    beat_backend_logger = logging.getLogger('beat.backend.python')
-    beat_backend_logger.setLevel(logging.DEBUG)
-    beat_backend_logger.addHandler(handler)
+    for logger_name in ['beat.core', 'beat.backend.python']:
+      logger = logging.getLogger(logger_name)
+      logger.setLevel(logging.DEBUG)
+      logger.addHandler(handler)
 
 
 def setup_package():