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/clustering/znode.py

@@ -1,20 +1,10 @@
 #!/usr/bin/python
 # Copyright 2015 WP Engine, Inc. All rights reserved.
-#
-# 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'],
@@ -111,14 +101,17 @@ EXAMPLES = """
   delegate_to: 127.0.0.1
 """
 
+import time
+
 try:
     from kazoo.client import KazooClient
-    from kazoo.exceptions import NoNodeError, ZookeeperError
     from kazoo.handlers.threading import KazooTimeoutError
     KAZOO_INSTALLED = True
 except ImportError:
     KAZOO_INSTALLED = False
 
+from ansible.module_utils.basic import AnsibleModule
+
 
 def main():
     module = AnsibleModule(
@@ -261,7 +254,6 @@ class KazooCommandProxy():
         return False, {'msg': 'The node did not appear before the operation timed out.', 'timeout': timeout,
                        'znode': path}
 
-from ansible.module_utils.basic import *
 
 if __name__ == '__main__':
     main()