Description of problem:
Same results returns using the current parameters with all possible options:
True, False and none (no parameter), seems like the true value is used always, since the return results klolooks the same, he file_id doesn't registered in the config (DB) in false value.


Version-Release number of selected component (if applicable):
Si24.1

How reproducible:
Always

Steps to Reproduce:
1. while VM is up send the following api call:
2. PUT api/vms/xxx/cdroms/yyy;current=True

<cdrom id="xxx">
    <file id="zzz.iso"/>
</cdrom>

3.PUT api/vms/xxx/cdroms/yyy;current=False

<cdrom id="xxx">
    <file id="zzz.iso"/>
</cdrom>
  
Actual results:
-- Returned XML: 

  <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <cdrom id="yyy">
      <file id="zzziso"/>
  </cdrom>

-- no config change in any of the configurations

Expected results:
-- different behaviour for true and false parameter.

Additional info: