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/s3_bucket_info.py

@@ -1,14 +1,10 @@
 #!/usr/bin/python
-"""
-Copyright (c) 2017 Ansible Project
-GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
-"""
+# -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function
-__metaclass__ = type
+# Copyright (c) 2017 Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
-
-DOCUMENTATION = '''
+DOCUMENTATION = r"""
 ---
 module: s3_bucket_info
 version_added: 1.0.0
@@ -114,12 +110,12 @@
     default: False
     version_added: 1.4.0
 extends_documentation_fragment:
-  - amazon.aws.aws
-  - amazon.aws.ec2
+  - amazon.aws.common.modules
+  - amazon.aws.region.modules
   - amazon.aws.boto3
-'''
+"""
 
-EXAMPLES = '''
+EXAMPLES = r"""
 # Note: These examples do not set authentication details, see the AWS Guide for details.
 
 # Note: Only AWS S3 is currently supported
@@ -157,9 +153,9 @@
 - name: List buckets
   ansible.builtin.debug:
     msg: "{{ result['buckets'] }}"
-'''
+"""
 
-RETURN = '''
+RETURN = r"""
 bucket_list:
   description: "List of buckets"
   returned: always
@@ -399,17 +395,19 @@
               returned: always
               type: str
               sample: https
-'''
+"""
 
 try:
     import botocore
 except ImportError:
     pass  # Handled by AnsibleAWSModule
 
+from ansible.module_utils.common.dict_transformations import camel_dict_to_snake_dict
+
+from ansible_collections.amazon.aws.plugins.module_utils.retries import AWSRetry
+from ansible_collections.amazon.aws.plugins.module_utils.tagging import boto3_tag_list_to_ansible_dict
+
 from ansible_collections.community.aws.plugins.module_utils.modules import AnsibleCommunityAWSModule as AnsibleAWSModule
-from ansible_collections.amazon.aws.plugins.module_utils.ec2 import AWSRetry
-from ansible_collections.amazon.aws.plugins.module_utils.ec2 import boto3_tag_list_to_ansible_dict
-from ansible_collections.amazon.aws.plugins.module_utils.ec2 import camel_dict_to_snake_dict
 
 
 def get_bucket_list(module, connection, name="", name_filter=""):