docs: def purgeRDR(rh):
      """
      Purge the reader belonging to the virtual machine.
  
      Input:
         Request Handle with the following properties:
            function    - 'CHANGEVM'
            subfunction - 'PURGERDR'
            userid      - userid of the virtual machine
  
      Output:
         Request Handle updated with the results.
         Return code - 0: ok, non-zero: error
      """
  
      rh.printSysLog("Enter changeVM.purgeRDR")
      results = purgeReader(rh)
      rh.updateResults(results)
      rh.printSysLog("Exit changeVM.purgeRDR, rc: " +
          str(rh.results['overallRC']))
      return rh.results['overallRC']