Modify pending tasks count in the UI to pending jobs count in the UI
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                 Key: HADOOP-4576
                 URL: https://issues.apache.org/jira/browse/HADOOP-4576
             Project: Hadoop Core
          Issue Type: Bug
          Components: contrib/capacity-sched
    Affects Versions: 0.19.0
            Reporter: Hemanth Yamijala


The UI for capacity scheduler displays 'pending tasks' counts. However the 
capacity scheduler does not update these counts to be the actual values for 
optimization purposes, for e.g. to avoid walking all pending jobs on all 
heartbeats. Hence this information is not very accurate.

Also, while 'running tasks' counts are useful to compare against capacities and 
limits, 'pending tasks' counts do not add too much user value. A better count 
to display would be the number of running and pending jobs.

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