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add variables with defaults to AWS EMR module #81

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This allows for some additional configuration, but defaults to the current hard-coded or empty values. The important one for us is the key_name so that we can do some troubleshooting.

Adding unhealthy_node_replacement would be a breaking change for v4 that the example uses, so I just commented that out until it's been updated.

Without ssh access, there's no way to clean up Spark's job history, and
the cleaner is disabled by default. This enables the cleaner with the
default values and allows modifications.

https://repost.aws/knowledge-center/core-node-emr-cluster-disk-space
https://spark.apache.org/docs/latest/monitoring.html#spark-history-server-configuration-options
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