[ecs_service] fix assign_public ip for network configuration (#41685)

* fix assign_public ip for ecs_service

* used module.botocore_at_least instead of distutils

lib/ansible/modules/cloud/amazon/ecs_service.py

@@ -102,6 +102,7 @@ options:
           - network configuration of the service. Only applicable for task definitions created with C(awsvpc) I(network_mode).
           - I(network_configuration) has two keys, I(subnets), a list of subnet IDs to which the task is attached and I(security_groups),
             a list of group names or group IDs for the task
+          - assign_public_ip requires botocore >= 1.8.4
         version_added: 2.6
     launch_type:
         description:
@@ -324,6 +325,10 @@ class EcsServiceManager:
                 except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
                     self.module.fail_json_aws(e, msg="Couldn't look up security groups")
             result['securityGroups'] = groups
+        if 'assign_public_ip' in network_config and self.module.botocore_at_least('1.8.4'):
+            result['assign_public_ip'] = 'assign_public_ip'
+        else:
+            self.module.fail_json(msg='botocore needs to be version 1.8.4 or higher to use assign_public_ip in network_configuration')
         return dict(awsvpcConfiguration=result)
 
     def find_in_array(self, array_of_services, service_name, field_name='serviceArn'):