As reported by Martin Korbel in https://bugzilla.redhat.com/show_bug.cgi?id=1112227

Description of problem:
We cannot create new guest from the RHEV template image. We get this error message "Unable to save
Failed to create a compute RHEV-resource (RHEV) instance rhev20.test.example.com: Cannot add VM. Cannot set single display device to non Linux operating system."

Version-Release number of selected component (if applicable):
Satellite-6.0.3-RHEL-6-20140618.0

How reproducible:
100%

Steps to Reproduce:
1. We have got Sat6 with RHEV compute resource. In this RHEV, we have got prepared the template (RHEL6, what was prepared using by this manual https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.4/html/Administration_Guide/Sealing_a_Linux_Virtual_Machine_for_Deployment_as_a_Template_using_sys-unconfig.html)
2. Create new image ("infrastructure" > "Compute resources" > our RHEV resource > "Images" > "New Image").
Name: myTemplateRHEL6.5
Operatingsystem: RHEL Server 6.5
Architecture: x86_64
Username: root
Password: xxx
Image: <choose our RHEV template>
Press "submit".
3. We open "Kickstart default finish" in "Hosts" > "Provisioning Templates" and Add association with "RHEL Server 6.5".
4. We open "RHEL Server 6.5" in "Hosts" > "Operating systems" and in the Templates tab, we select
finish: "Kickstart default finish"
5. We try to create new guest from template. Open "Hosts" > "New Host"
Host
----------------------------------
Name: something
Deploy on: RHEV
Lifecycle environment: <select one>
Content view: <select one>

Network
----------------------------------
Domain: <selct one>
Subnet: <selct one>

Operating System
----------------------------------
Architecture: x86_64
Operating system: RHEL Server 6.5
Provisioning Method: Image Based
Image: myTemplateRHEL6.5
press "Resolve" button and we get "finish Template - Kickstart default finish"

6. Press "Submit" button. We get this error message "Unable to save
Failed to create a compute RHEV-resource (RHEV) instance rhev20.test.example.com: Cannot add VM. Cannot set single display device to non Linux operating system."
Logs are in the attachment first.txt (Attachment 911396 [details]).

7. We change nothing and press "Submit" button again.
At first, all look like good, but then we can detected, Sat6 created new guest without HDD.
Logs are in the attachment second.txt (Attachment 911397 [details]).

Actual results:
impossible create new guests from template image.