Description of problem:
It is impossible to start previously installed KVM guest from Satellite
web ui.

Version-Release number of selected component (if applicable):
Satellite 5.3.0 / rhn-virtualization-host-5.3.0-12.el5sat

How reproducible:
Deterministic

Steps to Reproduce:
1. Have a RHEL-5.4 (or later) x86_64 KVM host (the hardware needs to
support full virtualization) registered to a Satellite 5.3.0
2. Install a KVM guest on your host & register it to the satellite
3. Power off your KVM guest (via virt-manager for example)
4. In satellite webui, see virtualization tab of your kvm host
5. Attempt to start your KVM guest from webui
6. See the action result in events tab
  
Actual results:
KVM guest domain does not start, following error shows in the system
events tab:
...
This action's status is: Failed.
The client picked up this action on 10/19/09 10:21:43 AM EDT.
The client completed this action on 10/19/09 10:21:43 AM EDT.
Client execution returned "Error occurred while attempting to recreate
domain 55708f20199a93cee5c7955994d273c4: unknown OS type xen" (code 1)
...

Expected results:
No error, KVM guest starts successfully.

Additional info:
N/A