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_network.py

@@ -1,21 +1,11 @@
 #!/usr/bin/python
 #
 # Copyright 2016 Red Hat | Ansible
-#
-# 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'],
@@ -161,14 +151,12 @@ facts:
     sample: {}
 '''
 
-from ansible.module_utils.docker_common import *
+from ansible.module_utils.docker_common import AnsibleDockerClient, DockerBaseClass, HAS_DOCKER_PY_2
 
 try:
     from docker import utils
     if HAS_DOCKER_PY_2:
-        from docker.types import Ulimit, IPAMPool, IPAMConfig
-    else:
-        from docker.utils.types import Ulimit
+        from docker.types import IPAMPool, IPAMConfig
 except:
     # missing docker-py handled in ansible.module_utils.docker
     pass
@@ -390,8 +378,6 @@ def main():
     cm = DockerNetworkManager(client)
     client.module.exit_json(**cm.results)
 
-# import module snippets
-from ansible.module_utils.basic import *
 
 if __name__ == '__main__':
     main()