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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 -->

try:
        return connection.describe_tags(ResourceArns=[target_group_arn])['TagDescriptions'][0]['Tags']
    except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
        module.fail_json_aws(e, msg="Couldn't get target group tags")
def get_target_group(connection, module):
    try:
        target_group_paginator = connection.get_paginator('describe_target_groups')
        return (target_group_paginator.paginate(Names=[module.params.get("name")]).build_full_result())['TargetGroups'][0]
    except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
        if e.response['Error']['Code'] == 'TargetGroupNotFound':
            return None
        else:
            module.fail_json_aws(e, msg="Couldn't get target group")
def wait_for_status(connection, module, target_group_arn, targets, status):
    polling_increment_secs = 5
    max_retries = (module.params.get('wait_timeout') // polling_increment_secs)
    status_achieved = False
    for x in range(0, max_retries):
        try:
            response = connection.describe_target_health(TargetGroupArn=target_group_arn, Targets=targets)
            if response['TargetHealthDescriptions'][0]['TargetHealth']['State'] == status:
                status_achieved = True
                break
            else:
                time.sleep(polling_increment_secs)
        except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
            module.fail_json_aws(e, msg="Couldn't describe target health")
    result = response
    return status_achieved, result
def fail_if_ip_target_type_not_supported(module):