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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 -->

if 'UnhealthyThresholdCount' in params and tg['UnhealthyThresholdCount'] != params['UnhealthyThresholdCount']:
                health_check_params['UnhealthyThresholdCount'] = params['UnhealthyThresholdCount']
            
            if tg['HealthCheckProtocol'] != 'TCP':
                
                if 'HealthCheckPath'in params and tg['HealthCheckPath'] != params['HealthCheckPath']:
                    health_check_params['HealthCheckPath'] = params['HealthCheckPath']
                
                
                if 'Matcher' in params:
                    current_matcher_list = tg['Matcher']['HttpCode'].split(',')
                    requested_matcher_list = params['Matcher']['HttpCode'].split(',')
                    if set(current_matcher_list) != set(requested_matcher_list):
                        health_check_params['Matcher'] = {}
                        health_check_params['Matcher']['HttpCode'] = ','.join(requested_matcher_list)
            try:
                if health_check_params:
                    connection.modify_target_group(TargetGroupArn=tg['TargetGroupArn'], **health_check_params)
                    changed = True
            except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
                module.fail_json_aws(e, msg="Couldn't update target group")
        
        if module.params.get("modify_targets"):
            
            
            try:
                current_targets = connection.describe_target_health(
                    TargetGroupArn=tg['TargetGroupArn'])
            except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
                module.fail_json_aws(e, msg="Couldn't get target group health")