Add CanonicalHostedZoneID NLB attribute as stack output

[evilneuro]

Add CanonicalHostedZoneID NLB attribute as stack output

• This allows a parent stack to create a Route 53 alias record to point at the NLB
• Just outputting the DNS name is insufficient, as an ALIAS requires the hosted zone ID of the target when the target resource is not in the same hosted zone

Example:

Resources:
  StackVSensor:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: !Ref VSensorDeploymentStackTemplateS3Uri
      Parameters:
        DarktraceInstanceHostname: !Ref SSMParamHostname
        DarktraceInstancePushtoken: !Ref SSMParamPpushtoken
        DarktraceInstanceProxy: !Ref SSMParamProxy
        InstanceType: !Ref VSensorInstanceType
        KeyPairName: !Ref EC2KPVSensorAppliance
        InstanceSecurityGroups: ''
        VsensorUpdatekey: !Ref SSMParamUpdatekey
        DesiredCapacityASG: !Ref VSensorDesiredCapacityASG
        MinSizeASG: !Ref VSensorMinSizeASG
        MaxSizeASG: !Ref VSensorMaxSizeASG
        osSensorHMAC: !Ref SSMParamHmac
        DeploymentVPC: !Ref VPCCore
        VpcCIDRBlock: !GetAtt VPCCore.CidrBlock
        SshCIDRBlock: !Ref SshCidrBlock
        Subnets: !Ref VSensorSubnets
        TrafficMirrorRuleNumber: 100
        TrafficMirrorSourceCIDR: 0.0.0.0/0
        TrafficMirrorDestCIDR: 0.0.0.0/0
        LogGroupRetention: 30
        LifecycleS3BucketDays: 7
        ShortID: ''
    DeletionPolicy: !Ref UpdateReplaceDeletePolicy
    UpdateReplacePolicy: !Ref UpdateReplaceDeletePolicy
  Route53RecordSetNLBVSensor:
    Type: AWS::Route53::RecordSet
    Properties:
      Name: !Sub ${AWS::Region}.example.net.
      Type: A
      AliasTarget:
        DNSName: !GetAtt StackVSensor.Outputs.LoadBalancerDNS
        EvaluateTargetHealth: false
        HostedZoneId: !GetAtt StackVSensor.Outputs.LoadBalancerDNSZoneID
    DeletionPolicy: !Ref UpdateReplaceDeletePolicy
    UpdateReplacePolicy: !Ref UpdateReplaceDeletePolicy