Description of problem:
Adding watchdog with model and action fails on 500 internal error via ovirt-shell or REST

Version-Release number of selected component (if applicable):
ovirt-rc1

How reproducible:
100%

Steps to Reproduce:
1. curl -X POST -H "Accept: application/xml" -H "Content-Type: application/xml" -u admin@internal:$pwd --cacert ca.crt -d "<watchdog><model>i6300esb</model><action>reset</action></watchdog>" https://$url:443/api/vms/$vmid/watchdogs
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><fault><reason>Operation Failed</reason></fault>[~] $ ^C

2. ovirt-shell ~ add watchdog --vm-identifier dd35488d-f247-461f-b45c-f6b7b004e270 --action reset --model i6300esb

  ==================================== ERROR =================================
  status: 500
  reason: Internal Server Error
  detail:
  ============================================================================


Actual results:


Expected results:


Additional info: