Update tag and metric names to conform to HADOOP-887
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Key: HADOOP-890
URL: https://issues.apache.org/jira/browse/HADOOP-890
Project: Hadoop
Issue Type: Improvement
Components: metrics
Affects Versions: 0.10.1
Reporter: Nigel Daley
Priority: Minor
In preparation for HADOOP-887, update the current tag and metric names that use
currently use '-'. Convert all '-' to '_'.
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