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/aws_region_info.py

@@ -1,12 +1,10 @@
 #!/usr/bin/python
+# -*- coding: utf-8 -*-
+
 # Copyright (c) 2017 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: aws_region_info
 short_description: Gather information about AWS regions
 version_added: 1.0.0
@@ -26,12 +24,12 @@
     default: {}
     type: dict
 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.
 
 # Gather information about all regions
@@ -41,9 +39,9 @@
 - community.aws.aws_region_info:
     filters:
       region-name: eu-west-1
-'''
+"""
 
-RETURN = '''
+RETURN = r"""
 regions:
     returned: on success
     description: >
@@ -54,18 +52,21 @@
         'endpoint': 'ec2.us-west-1.amazonaws.com',
         'region_name': 'us-west-1'
     }]"
-'''
-
-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 ansible_dict_to_boto3_filter_list
-from ansible_collections.amazon.aws.plugins.module_utils.ec2 import camel_dict_to_snake_dict
+"""
 
 try:
-    from botocore.exceptions import ClientError, BotoCoreError
+    from botocore.exceptions import BotoCoreError
+    from botocore.exceptions import ClientError
 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.transformation import ansible_dict_to_boto3_filter_list
+
+from ansible_collections.community.aws.plugins.module_utils.modules import AnsibleCommunityAWSModule as AnsibleAWSModule
+
 
 def main():
     argument_spec = dict(