Disable test DAV server logging by default

DAV server logs produce many lines of output during test runs that
obscure more relevant messages.

This change makes the server logging conditional on a datalad log level
of debug or more verbose.

Ping #503

datalad_next/tests/utils.py

@@ -89,6 +89,9 @@ def __enter__(self):
             "port": 43612,
             "provider_mapping": {"/": str(self.path)},
             "simple_dc": {"user_mapping": {'*': auth}},
+            # disable DAV server logging to avoid clustering the test output
+            # unless logger runs at least on debug log level
+            "logging": {"enable": lgr.isEnabledFor(10)},
         }
         app = WsgiDAVApp(config)
         self.server = wsgi.Server(