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  1. Hadoop YARN
  2. YARN-11029

Refactor AMRMProxy Service code and Added Some Metrics

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      the original title of this jira

      Improve logs to print askCount, allocatedCount in AMRMProxy service

      In the process of completion, it is found that it is better to display the reuqestcount in a metric way, which is better

      This pr does the following work:

      1. AMRMProxy service log information optimization.
      2. Added 2 metrics to display updateAMRMTokens, stopApplication, requestCount.
      3. Added statistical requestCount and allocatedCount variables and displayed them in the log.
      4. Supplement Metric's Junit Test.
      5. Fix Some Typo Error.

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              slfan1989 Shilun Fan
              minni31 Minni Mittal
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