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##### SUMMARY
elb_network_lb and elb_target_group should support UDP, currently only HTTP, HTTPS and TCP are supported by ansible.

Based on the current pages, UDP and TCP_UDP are supported as protocols:
- https://docs.aws.amazon.com/elasticloadbalancing/latest/network/create-listener.html
- https://docs.aws.amazon.com/elasticloadbalancing/latest/network/create-target-group.html

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
- elb_target_group
- elb_network_lb

##### ADDITIONAL INFORMATION
It would be useful to use UDP as a protocol for an NLB, additionally, attached target groups would need to support UDP.

TCP_UDP is another protocol that it would be useful to add support for (a port that would take TCP or UDP traffic and not care)

<!--- Paste example playbooks or commands between quotes below -->
```yaml
    - name: Create logstash target group
      elb_target_group:
        name: logstash_bunyan_production_tg
        protocol: udp
        port: 5600
        vpc_id: "{{ vpc_facts.vpcs[0].id }}"
        state: present

    - name: Create nlb
      elb_network_lb:
        name: logstash_nlb
        subnets: "{{ private_subnets + public_subnets }}"
        health_check_path: "/"
        health_check_port: "9600"
        health_check_protocol: "http"
        protocol: "udp"
        port: "5600"
        listeners:
          - Protocol: UDP
            Port: 5600
            DefaultActions:
              - Type: forward
                TargetGroupName: logstash_bunyan_production_tg
        state: present
```

<!--- HINT: You can also paste gist.github.com links for larger files -->

connection.delete_target_group(TargetGroupArn=tg['TargetGroupArn'])
            module.fail_json_aws(e, msg="Couldn't delete target group")
    
    if tags:
        
        current_tags = get_target_group_tags(connection, module, tg['TargetGroupArn'])
        
        tags_need_modify, tags_to_delete = compare_aws_tags(boto3_tag_list_to_ansible_dict(current_tags), tags, purge_tags)
        if tags_to_delete:
            try:
                connection.remove_tags(ResourceArns=[tg['TargetGroupArn']], TagKeys=tags_to_delete)
            except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
                module.fail_json_aws(e, msg="Couldn't delete tags from target group")
            changed = True
        
        if tags_need_modify:
            try:
                connection.add_tags(ResourceArns=[tg['TargetGroupArn']], Tags=ansible_dict_to_boto3_tag_list(tags_need_modify))
            except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
                module.fail_json_aws(e, msg="Couldn't add tags to target group")
            changed = True
    
    tg = get_target_group(connection, module)
    
    tg.update(get_tg_attributes(connection, module, tg['TargetGroupArn']))
    
    snaked_tg = camel_dict_to_snake_dict(tg)
    snaked_tg['tags'] = boto3_tag_list_to_ansible_dict(get_target_group_tags(connection, module, tg['TargetGroupArn']))
    module.exit_json(changed=changed, **snaked_tg)
def delete_target_group(connection, module):