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@a4f20bf

plugins/modules/iam_password_policy.py

@@ -1,21 +1,18 @@
 #!/usr/bin/python
+# -*- coding: utf-8 -*-
 
 # Copyright: (c) 2018, Aaron Smith <ajsmith10381@gmail.com>
 # 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_password_policy
 version_added: 1.0.0
 short_description: Update an IAM Password Policy
 description:
-    - Module updates an IAM Password Policy on a given AWS account
+  - Module updates an IAM Password Policy on a given AWS account
 author:
-    - "Aaron Smith (@slapula)"
+  - "Aaron Smith (@slapula)"
 options:
   state:
     description:
@@ -75,13 +72,12 @@
     type: bool
     aliases: [password_expire, expire]
 extends_documentation_fragment:
-- amazon.aws.aws
-- amazon.aws.ec2
-- amazon.aws.boto3
+  - amazon.aws.common.modules
+  - amazon.aws.region.modules
+  - amazon.aws.boto3
+"""
 
-'''
-
-EXAMPLES = '''
+EXAMPLES = r"""
 - name: Password policy for AWS account
   community.aws.iam_password_policy:
     state: present
@@ -94,9 +90,9 @@
     pw_max_age: 60
     pw_reuse_prevent: 5
     pw_expire: false
-'''
+"""
 
-RETURN = ''' # '''
+RETURN = r""" # """
 
 try:
     import botocore
@@ -105,8 +101,9 @@
 
 from ansible.module_utils.common.dict_transformations import camel_dict_to_snake_dict
 
+from ansible_collections.amazon.aws.plugins.module_utils.botocore import is_boto3_error_code
+
 from ansible_collections.community.aws.plugins.module_utils.modules import AnsibleCommunityAWSModule as AnsibleAWSModule
-from ansible_collections.amazon.aws.plugins.module_utils.core import is_boto3_error_code
 
 
 class IAMConnection(object):