hacking: H102, H103 Apache License check violations

Apache License checks have been added to hacking.py.

    H102 Apache 2.0 license header not found
    H103 Header does not match Apache 2.0 License notice

Some files in neutron do not follow them. The following are examples.
it is better to fix them rather than ignoring them in tox.ini.

<license>!=<apache2>:
'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.' !=
'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.'
./neutron/api/v2/attributes.py:6:6: H103 Header does not match Apache 2.0 License notice
# Licensed under the Apache License, Version 2.0 (the 'License'); you may

./neutron/tests/unit/nicira/test_nvp_api_common.py:1:1: H102 Apache 2.0 license header not found
# Copyright (C) 2009-2011 Nicira Networks, Inc. All Rights Reserved.
^