Fixup a comment, suppress logging during tests

- Commit 947470d77112a5ee0ab1a037d77104cdb25c18e5 rendered a comment inaccurate
  in syncserver/__init__.py.

- Logging to stdout by default obscures test results; disable the stdout deluge
  by changing the logging class in syncserver/tests.ini

syncserver/__init__.py

@@ -62,8 +62,7 @@ def includeme(config):
         settings["browserid.backend"] = "tokenserver.verifiers.RemoteVerifier"
         settings["browserid.audiences"] = public_url
     if "metlog.backend" not in settings:
-        # Default to capturing metlog output in memory.
-        # In other words, stop of from being so damn chatty on stdout.
+        # Default to sending metlog output to stdout.
         settings["metlog.backend"] = "mozsvc.metrics.MetlogPlugin"
         settings["metlog.sender_class"] = "metlog.senders.StdOutSender"
         settings["metlog.enabled"] = True

syncserver/tests.ini

@@ -15,3 +15,9 @@ public_url = http://localhost:5000/
 
 # This is a secret key used for signing authentication tokens.
 #secret = INSERT_SECRET_KEY_HERE
+
+# Enable metlog during tests, but do not log normal traffic to stdout.
+[metlog]
+backend = "mozsvc.metrics.MetlogPlugin"
+sender_class = "metlog.senders.DebugCaptureSender"
+enabled = True