fix pep8 issues

Change-Id: I597040ac536c1d45ceae5183e48ef809e7db38e9

oslo_metrics/__main__.py

 # Copyright 2020 LINE Corp.
+# All Rights Reserved.
 #
-#    Licensed under the Apache License, Version 2.0 (the 'License'); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
 #
-#         http://www.apache.org/licenses/LICENSE-2.0
+#      http://www.apache.org/licenses/LICENSE-2.0
 #
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
 
 import os
 import select
@@ -53,7 +54,8 @@ class MetricsListener():
 
     def serve(self):
         while self.start:
-            readable, writable, exceptional = select.select([self.socket], [], [], 1)
+            readable, writable, exceptional = select.select(
+                [self.socket], [], [], 1)
             if len(readable) == 0:
                 continue
             try:

oslo_metrics/message_router.py

 # Copyright 2020 LINE Corp.
+# All Rights Reserved.
 #
-#    Licensed under the Apache License, Version 2.0 (the 'License'); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
 #
-#         http://www.apache.org/licenses/LICENSE-2.0
+#      http://www.apache.org/licenses/LICENSE-2.0
 #
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
 
 from oslo_log import log as logging
 from oslo_utils import importutils

oslo_metrics/message_type.py

+# Copyright 2020 LINE Corp.
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
 import json
 
 
@@ -27,7 +42,7 @@ class MetricAction():
             raise MetricValidationError("action need 'action' field")
         if metric_action_dict["action"] not in cls.actions:
             raise MetricValidationError(
-                    "action should be choosen from %s" % cls.actions)
+                "action should be choosen from %s" % cls.actions)
 
     @classmethod
     def from_dict(cls, metric_action_dict):

oslo_metrics/metrics/oslo_messaging.py

-# Copyright 2019 LINE Corp.
+# Copyright 2020 LINE Corp.
+# All Rights Reserved.
 #
-#    Licensed under the Apache License, Version 2.0 (the 'License'); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
 #
-#         http://www.apache.org/licenses/LICENSE-2.0
+#      http://www.apache.org/licenses/LICENSE-2.0
 #
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
 import prometheus_client
 
 standard_labels_for_server = [