Fix default values for launch template metadata.

[lvthillo]

Description

Launch Template metadata options does not use default values as described in the docs.

Example (4.50):

resource "aws_launch_template" "lt" {
  name                   = "test-lt"
  image_id               = "ami-0fe0b2cf0e1f25c8a"
  instance_type          = "t3.small"
  vpc_security_group_ids = ["sg-12345678"]

  metadata_options {
    http_tokens = "optional"
  }
}

Plan:

  + metadata_options {
      + http_endpoint               = (known after apply)
      + http_protocol_ipv6          = "disabled"
      + http_put_response_hop_limit = (known after apply)
      + http_tokens                 = "optional"
      + instance_metadata_tags      = "disabled"
    }

Describe using AWS CLI after apply

  "LaunchTemplateData": {
      "ImageId": "ami-0fe0b2cf0e1f25c8a",
      "InstanceType": "t3.small",
      "UserData": "",
      "SecurityGroupIds": [
          "sg-12345678"
      ],
      "MetadataOptions": {
          "HttpProtocolIpv6": "disabled"
      }
}

By using this PR + same TF code:
Plan:

  + metadata_options {
      + http_endpoint               = "enabled"
      + http_protocol_ipv6          = "disabled"
      + http_put_response_hop_limit = 1
      + http_tokens                 = "optional"
      + instance_metadata_tags      = "disabled"
    }

Describe using CLI:

    "LaunchTemplateData": {
        "ImageId": "ami-0fe0b2cf0e1f25c8a",
        "InstanceType": "t3.small",
        "UserData": "",
        "SecurityGroupIds": [
            "sg-12345678"
        ],
        "MetadataOptions": {
            "HttpTokens": "optional",
            "HttpPutResponseHopLimit": 1,
            "HttpEndpoint": "enabled",
            "HttpProtocolIpv6": "disabled",
            "InstanceMetadataTags": "disabled"
        }
    }

Relations

Relates #12564

References

Output from Acceptance Testing

$ make testacc TESTS=TestAccEC2LaunchTemplate_metadataOptions PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2LaunchTemplate_metadataOptions'  -timeout 180m
=== RUN   TestAccEC2LaunchTemplate_metadataOptions
=== PAUSE TestAccEC2LaunchTemplate_metadataOptions
=== CONT  TestAccEC2LaunchTemplate_metadataOptions
--- PASS: TestAccEC2LaunchTemplate_metadataOptions (62.61s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        67.316s

...

[github-actions]

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[johnsonaj]

Relates #30393

[gdavison]

Thanks for taking the time to submit this PR, @lvthillo. In this case, the documentation is incorrect. The default values for a Launch Template should be to not specify a value, and require the instance to specify a value.

[github-actions]

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