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/cloud/docker/docker_login.py

@@ -4,21 +4,10 @@
 #          Chris Houseknecht, <house@redhat.com>
 #          James Tanner, <jtanner@redhat.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',
@@ -142,9 +131,12 @@ login_results:
 '''
 
 import base64
+import json
+import os
+import re
 
 from ansible.module_utils._text import to_bytes, to_text
-from ansible.module_utils.docker_common import *
+from ansible.module_utils.docker_common import AnsibleDockerClient, DEFAULT_DOCKER_REGISTRY, DockerBaseClass, EMAIL_REGEX
 
 
 class LoginManager(DockerBaseClass):
@@ -333,8 +325,6 @@ def main():
         del results['actions']
     client.module.exit_json(**results)
 
-# import module snippets
-from ansible.module_utils.basic import *
 
 if __name__ == '__main__':
     main()