Ganglia counter metrics are all reported with the metric name "value", so the 
counter values can not be seen
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                 Key: HADOOP-3422
                 URL: https://issues.apache.org/jira/browse/HADOOP-3422
             Project: Hadoop Core
          Issue Type: Bug
          Components: metrics
    Affects Versions: 0.16.4
            Reporter: Jason
             Fix For: 0.17.0


The JobInProgress class reports all metrics with the name "value". The 
FileMetrics class puts all of the tags into the name when reporting the 
individual values, but the Ganglia Context does not put the tags into the name..

This patch modifies the context to build names for the counter metrics out of 
the tag values. This enables the user to see the indivdual counter values with 
the ganglia web tool, on a per job basis

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