Support ${hostname} placeholder #54
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EC2 instances do not always have a
Nametag, e.g. EKS worker nodes. When the tag is missing, fluentd logs are spammed by the plugin with[warn]: [filter_ec2_metadata] ec2-metadata: unknown placeholder${tagset_name}found in a tag. This PR exposes the${hostname}placeholder that we can use instead of theNametag.