Cleanup headers and imports (ansible-collections#1738)

Cleanup headers and imports

SUMMARY
Mass update of imports, docs fragments and file headers

Many of the amazon.aws module_utils and docs fragments got moved about, update community.aws to reflect this.
Consistently apply the comment headers as documented at https://docs.ansible.com/ansible/devel/dev_guide/developing_modules_documenting.html#python-shebang-utf-8-coding

ISSUE TYPE

Docs Pull Request
Feature Pull Request

COMPONENT NAME
ADDITIONAL INFORMATION
Header cleanup based upon:
https://docs.ansible.com/ansible/devel/dev_guide/developing_modules_documenting.html#python-shebang-utf-8-coding

Begin your Ansible module with #!/usr/bin/python - this “shebang” allows ansible_python_interpreter to work. Follow the shebang immediately with # -*- coding: utf-8 -*- to clarify that the file is UTF-8 encoded.

and
https://docs.ansible.com/ansible/devel/dev_guide/developing_modules_documenting.html#copyright-and-license

After the shebang and UTF-8 coding, add a copyright line with the original copyright holder and a license declaration. The license declaration should be ONLY one line, not the full GPL prefix.
...
Additions to the module (for instance, rewrites) are not permitted to add additional copyright lines other than the default copyright statement if missing:

Reviewed-by: Alina Buzachis

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections/community.aws@a4f20bf

plugins/modules/iam_mfa_device_info.py

@@ -1,31 +1,30 @@
 #!/usr/bin/python
+# -*- coding: utf-8 -*-
+
 # Copyright: Ansible Project
 # 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
-
-
-DOCUMENTATION = '''
+DOCUMENTATION = r"""
 ---
 module: iam_mfa_device_info
 version_added: 1.0.0
 short_description: List the MFA (Multi-Factor Authentication) devices registered for a user
 description:
-    - List the MFA (Multi-Factor Authentication) devices registered for a user
-author: Victor Costan (@pwnall)
+  - List the MFA (Multi-Factor Authentication) devices registered for a user
+author:
+  - Victor Costan (@pwnall)
 options:
   user_name:
     description:
       - The name of the user whose MFA devices will be listed
     type: str
 extends_documentation_fragment:
-- amazon.aws.aws
-- amazon.aws.ec2
-- amazon.aws.boto3
-'''
+  - amazon.aws.common.modules
+  - amazon.aws.region.modules
+  - amazon.aws.boto3
+"""
 
-RETURN = """
+RETURN = r"""
 mfa_devices:
     description: The MFA devices registered for the given user
     returned: always
@@ -39,7 +38,7 @@
         user_name: example
 """
 
-EXAMPLES = r'''
+EXAMPLES = r"""
 # Note: These examples do not set authentication details, see the AWS Guide for details.
 
 # more details: https://docs.aws.amazon.com/IAM/latest/APIReference/API_ListMFADevices.html
@@ -54,7 +53,7 @@
     role_arn: "arn:aws:iam::123456789012:role/someRole"
     role_session_name: "someRoleSession"
   register: assumed_role
-'''
+"""
 
 try:
     import botocore