Add boilerplate and remove wildcard imports for openstack modules (#31461)

* Add boilerplate and remove wildcard imports for openstack modules
* Remove openstack files that are now pep8 compliant from the legacy list

lib/ansible/modules/cloud/openstack/os_user.py

@@ -1,18 +1,10 @@
 #!/usr/bin/python
 # 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.
-#
-# 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.
-#
-# You should have received a copy of the GNU General Public License
-# along with this software.  If not, see <http://www.gnu.org/licenses/>.
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
 
 ANSIBLE_METADATA = {'metadata_version': '1.1',
                     'status': ['preview'],
@@ -145,13 +137,14 @@ user:
             type: string
             sample: "demouser"
 '''
+from distutils.version import StrictVersion
 
 try:
     import shade
     HAS_SHADE = True
 except ImportError:
     HAS_SHADE = False
-from distutils.version import StrictVersion
+
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.openstack import openstack_full_argument_spec, openstack_module_kwargs