Python 3 compatibility error handling: use to_native(e) instead of st…

…r(e) or e.me… (ansible-collections#26)

* Py3 compat error handling: use to_native(e) instead of str(e) or e.message
* PR comment changes, use fail_json_aws and is_boto3_error_code

plugins/modules/ec2_instance_info.py

@@ -516,7 +516,7 @@ def list_ec2_instances(connection, module):
         reservations_paginator = connection.get_paginator('describe_instances')
         reservations = reservations_paginator.paginate(InstanceIds=instance_ids, Filters=filters).build_full_result()
     except ClientError as e:
-        module.fail_json(msg=e.message, exception=traceback.format_exc(), **camel_dict_to_snake_dict(e.response))
+        module.fail_json_aws(e, msg="Failed to list ec2 instances")
 
     # Get instances from reservations
     instances = []