Add GPl License header to rackhd inventory file. (#24354)

contrib/inventory/rackhd.py

@@ -1,10 +1,24 @@
 #!/usr/bin/env python
 
-import argparse
+# This file is part of Ansible
+#
+# Ansible 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.
+#
+# Ansible 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
 import json
 import os
 import requests
-import types
+import argparse
 
 RACKHD_URL = 'http://localhost:8080'
 
@@ -51,6 +65,7 @@ def parse_args():
     parser.add_argument('--list', action='store_true')
     return parser.parse_args()
 
+
 try:
     # check if rackhd url(ie:10.1.1.45:8080) is specified in the environment
     RACKHD_URL = 'http://' + str(os.environ['RACKHD_URL'])