Krishnan Parthasarathi 0472e5c1e1 Change query param name to duration in list/clear locks API (#3664)
Following is a sample list lock API request schematic,

  /?lock&bucket=mybucket&prefix=myprefix&duration=holdDuration
  x-minio-operation: list

The response would contain the list of locks held on mybucket matching
myprefix for a duration longer than holdDuration.
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