Only add stdout handler when running as cli

vdirsyncer/cli.py

@@ -205,6 +205,8 @@ def _create_app():
         '''
         vdirsyncer -- synchronize calendars and contacts
         '''
+        log.add_handler(log.stdout_handler)
+
         verbosity = verbosity.upper()
         x = getattr(log.logging, verbosity, None)
         if x is None:

vdirsyncer/log.py

@@ -40,10 +40,14 @@ stdout_handler.formatter = ColorFormatter()
 default_level = logging.INFO
 
 
+def add_handler(handler):
+    for logger in loggers.values():
+        logger.addHandler(handler)
+
+
 def create_logger(name):
     x = logging.getLogger(name)
     x.setLevel(default_level)
-    x.addHandler(stdout_handler)
     return x