Review Request 20468: Add log cleaner metrics. (Cherry-picked from trunk)

[Joel Koshy]

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Review request for kafka.


Bugs: KAFKA-1380
    https://issues.apache.org/jira/browse/KAFKA-1380


Repository: kafka


Description
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KAFKA-1327 Add log cleaner metrics.


Diffs
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  core/src/main/scala/kafka/log/Log.scala 
b3ab5220a66a2ae82084dad89877daf60f613e66 
  core/src/main/scala/kafka/log/LogCleaner.scala 
312204c6ddd0cf46cd7349d79a43edec839bc361 
  core/src/main/scala/kafka/log/LogCleanerManager.scala 
79e9d556d22c5ecd9be2439e5c54caad9b58735c 
  core/src/main/scala/kafka/utils/Throttler.scala 
c6c3c75ee8408ca81aeeb5846f7987a287b5a6e8 

Diff: https://reviews.apache.org/r/20468/diff/


Testing
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Thanks,

Joel Koshy