Clean some log messages when polling neutron resources

- Handle the regular resource not found warnings when polling neutron
  resources
- Set the default log level of neutronclient to INFO to avoid recording
  requests of neutronclient token issuing.

Change-Id: I94836b3031bae5bee2634b301c67a0c9487112ac
Closes-Bug: #1504396

ceilometer/neutron_client.py

@@ -39,12 +39,11 @@ def logged(func):
     def with_logging(*args, **kwargs):
         try:
             return func(*args, **kwargs)
-        except exceptions.NotFound:
-            # handles 404's when services are disabled in neutron
-            LOG.warn("The resource could not be found.")
-            return []
         except exceptions.NeutronClientException as e:
-            LOG.warn(e)
+            if e.status_code == 404:
+                LOG.warn("The resource could not be found.")
+            else:
+                LOG.warn(e)
             return []
         except Exception as e:
             LOG.exception(e)

ceilometer/service.py

@@ -116,7 +116,8 @@ def prepare_service(argv=None, config_files=None):
     oslo_i18n.enable_lazy()
     log.register_options(cfg.CONF)
     log_levels = (cfg.CONF.default_log_levels +
-                  ['stevedore=INFO', 'keystoneclient=INFO'])
+                  ['stevedore=INFO', 'keystoneclient=INFO',
+                   'neutronclient=INFO'])
     log.set_defaults(default_log_levels=log_levels)
     if argv is None:
         argv = sys.argv