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Merge pull request #5894 from ewolinetz/logging_defaults_from_existing

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Update logging to use existing cluster deployment for defaults

This will allow us to use logging facts to set defaults of specific configurations such as ES index replicas and shard count.

The update to logging facts yields us output like: 
```json
"elasticsearch": {
            "clusterrolebindings": {}, 
            "configmaps": {
                "logging-elasticsearch": {
                    "elasticsearch.yml": {
                        "cloud": {
                            "kubernetes": {
                                "namespace": "${NAMESPACE}", 
                                "pod_label": "${POD_LABEL}", 
                                "pod_port": 9300
                            }
                        }, 
                        "cluster": {
                            "name": "${CLUSTER_NAME}"
                        }, 
                        "discovery": {
                            "type": "kubernetes", 
                            "zen.minimum_master_nodes": "${NODE_QUORUM}", 
                            "zen.ping.multicast.enabled": false
                        }, 
                        "gateway": {
                            "expected_nodes": "${RECOVER_EXPECTED_NODES}", 
                            "recover_after_nodes": "${NODE_QUORUM}", 
                            "recover_after_time": "${RECOVER_AFTER_TIME}"
                        }, 
                        "index": {
                            "number_of_replicas": 0, 
                            "number_of_shards": 1, 
                            "translog": {
                                "flush_threshold_period": "5m", 
                                "flush_threshold_size": "256mb"
                            }, 
                            "unassigned.node_left.delayed_timeout": "2m"
                        }, ... (continued)

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