reduce unnecessary logging during speedtest (#14387)

- speedtest logs calls that were canceled
  spuriously, in situations where it should
  be ignored.

- all errors of interest are always sent back
  to the client there is no need to log them
  on the server console.

- PUT failures should negate the increments
  such that GET is not attempted on unsuccessful
  calls.

- do not attempt MRF on speedtest objects.

cmd/xl-storage.go

@@ -2281,7 +2281,7 @@ func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath string, f
 				// Any failed rename calls un-roll previous transaction.
 				s.deleteFile(dstVolumeDir, legacyDataPath, true)
 			}
-			return err
+			return osErrToFileErr(err)
 		}
 
 		// renameAll only for objects that have xl.meta not saved inline.