Get rid of more wildcard imports and add boilerplate to more modules

This commit cleans up the following module categories:
* messaging
* inventory
* crypto
* commands
* clustering
* cloud/webfaction
* cloud/docker
* cloud/digital_ocean

lib/ansible/modules/messaging/rabbitmq_user.py

@@ -2,21 +2,11 @@
 # -*- coding: utf-8 -*-
 
 # (c) 2013, Chatham Financial <oss@chathamfinancial.com>
-#
-# 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/>.
+# 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': '1.0',
                     'status': ['preview'],
@@ -134,6 +124,9 @@ EXAMPLES = '''
     state: present
 '''
 
+from ansible.module_utils.basic import AnsibleModule
+
+
 class RabbitMqUser(object):
     def __init__(self, module, username, password, tags, permissions,
                  node, bulk_permissions=False):
@@ -308,8 +301,6 @@ def main():
 
     module.exit_json(changed=changed, user=username, state=state)
 
-# import module snippets
-from ansible.module_utils.basic import *
 
 if __name__ == '__main__':
     main()