[HBASE-17928] Shell tool to clear compaction queues - ASF JIRA

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Release Note:

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Adds clear_compaction_queues to the hbase shell.
{code}
  Clear compaction queues on a regionserver.
  The queue_name contains short and long.
  short is shortCompactions's queue,long is longCompactions's queue.

  Examples:
  hbase> clear_compaction_queues 'host187.example.com,60020'
  hbase> clear_compaction_queues 'host187.example.com,60020','long'
  hbase> clear_compaction_queues 'host187.example.com,60020', ['long','short']
{code}

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Adds clear_compaction_queues to the hbase shell. {code}   Clear compaction queues on a regionserver.   The queue_name contains short and long.   short is shortCompactions's queue,long is longCompactions's queue.      Examples:   hbase> clear_compaction_queues 'host187.example.com,60020'   hbase> clear_compaction_queues 'host187.example.com,60020','long'   hbase> clear_compaction_queues 'host187.example.com,60020', ['long','short'] {code}

scenario：
1. Compact a table by mistake
2. Compact is not completed within the specified time period

In this case, clearing the queue is a better choice, so as not to affect the stability of the cluster