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Remove hardcoded `hdfs://hdfs/` prefix from HDFS health check commands.
If any user has modified the cluster name to something other than 'hdfs', the current health check command won't work. We should double check the value of fs.default.name/fs.defaultFS that (a) DCOS-image ships with, and (b) the HDFS framework bundles in, since that's how hadoop fs is able to infer the hdfs://hdfs/ prefix.