Don't dbug log every added plugin route

It is killing testsuite output by drowning out all signals. It should
be sufficient to state in the pluginmanager that routes have been added,
if we need that kind of output.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

mediagoblin/app.py

@@ -96,7 +96,6 @@ class MediaGoblinApp(object):
         self.url_map = url_map
 
         for route in PluginManager().get_routes():
-            _log.debug('adding plugin route: {0}'.format(route))
             add_route(*route)
 
         # set up staticdirector tool