jamie/metrics compression #264
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This PR adds compression support to both metricsfetcher and topicmappr for metrics metadata that's used in rebalance commands or rebuild when configured with the 'storage' placement strategy.
Topicmappr will attempt to decompress the znode metrics data as gzip before deserializing the the json contents. If it fails (i.e. is not gzipped), it will simply move to handling the raw json text as it does now.
Closes #258
Alternative to #257