Correct license header on zuul change parsing code

When I originally stamped the license on to the code to parse
changes from zuul, I accidently stamped the incorrect license
on the file.  Since I'm the only person to have modified this
file, this change is to correct the license header.

Change-Id: I00c709698292120b7e668014dfcd6a8f35a55dda

playbooks/roles/ironic-install/files/parse_zuul_changes.py

@@ -1,19 +1,18 @@
 #!/usr/bin/env python
-
-# (c) 2015, Hewlett-Packard Development Company, L.P.
+# Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
 #
-# This module is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# 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
 #
-# This software is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+#    http://www.apache.org/licenses/LICENSE-2.0
 #
-# You should have received a copy of the GNU General Public License
-# along with this software.  If not, see <http://www.gnu.org/licenses/>.
+# 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 re
 import subprocess