logging: improve handling tween logging name

rhodecode/tweens.py

@@ -45,13 +45,13 b' def vcs_detection_tween_factory(handler,'
             request.environ[VCS_TYPE_KEY] = vcs_handler.SCM
             request.vcs_call = vcs_handler.SCM
 
-            log.debug('Processing request with `%s` handler', handler)
+            log.debug('Processing request with `%s` handler', handler.__name__)
             return handler(request)
 
         # mark that we didn't detect an VCS, and we can skip detection later on
         request.environ[VCS_TYPE_KEY] = VCS_TYPE_SKIP
 
-        log.debug('Processing request with `%s` handler', handler)
+        log.debug('Processing request with `%s` handler', handler.__name__)
         return handler(request)
 
     return vcs_detection_tween