Created attachment 770016 [details]
engine and automation logs

Description of problem:
When sending a request to unplug a disk from vm via REST, the response received from API was not in XML format. This was done using an automated test

Version-Release number of selected component (if applicable):
rhevm-3.3.0-0.6.master.el6ev.noarch

How reproducible:
?

Steps to Reproduce:
1. Create 2 vms each with 2 disks each
2. Create a shared disk
3. Plug disk to both vms
4. Deactivate disk on one vm
5. Deactivate disk on second vm
6. Detach disk from first vm

Actual results:
Response received from API is not in xml format

Expected results:
Response should be xml

Additional info:
Request that was sent:

url:/api/vms/cd7fb952-3b63-45fb-ac63-b3b96ada53d9/disks/cd30849e-8af2-47fd-bf76-c49bad2e0d47 
body:
<action>
    <detach>true</detach>
</action>

Response:
!!org.ovirt.engine.api.model.Action
actions: null
brick: null
cluster: null
comment: null
connectivityTimeout: null
creationStatus: null
description: null
fault: null
fenceType: null
gracePeriod: null
host: null
hostNics: null
href: null
id: null
image: null
iscsi: null
name: null
network: null
option: null
powerManagement: null
rootPassword: null
status: {detail: null, state: complete}
storageDomain: null
template: null
ticket: null
vm: null