Add Apache 2.0 license header to the alembic/script.py.mako

This patch can generate the new alembic/version file that include
the Apache 2.0 license header. It's follow the pep8.

Change-Id: I53759a0dc90a52d5658a4fc9652019b271988383

cloudkitty/db/sqlalchemy/alembic/script.py.mako

@@ -1,3 +1,18 @@
+# Copyright ${create_date.year} OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
 """${message}
 
 Revision ID: ${up_revision}

cloudkitty/rating/hash/db/sqlalchemy/alembic/script.py.mako

@@ -1,3 +1,18 @@
+# Copyright ${create_date.year} OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
 """${message}
 
 Revision ID: ${up_revision}

cloudkitty/rating/pyscripts/db/sqlalchemy/alembic/script.py.mako

@@ -1,3 +1,18 @@
+# Copyright ${create_date.year} OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
 """${message}
 
 Revision ID: ${up_revision}

cloudkitty/storage/gnocchi_hybrid/alembic/script.py.mako

@@ -1,3 +1,18 @@
+# Copyright ${create_date.year} OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
 """${message}
 
 Revision ID: ${up_revision}

cloudkitty/storage/sqlalchemy/alembic/script.py.mako

@@ -1,3 +1,18 @@
+# Copyright ${create_date.year} OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
 """${message}
 
 Revision ID: ${up_revision}