Description of problem:
If the VM is in the runnig state, its not possible to edit the 'Operating System' type. Its giving the below error message:

----
Error while executing action:

rhel6-vm:

    There was an attempt to change VM values while the VM is not down. Please shut down the VM in order to modify these properties.
----

Version-Release number of selected component (if applicable):
rhevm 3.3

How reproducible:
100%

Steps to Reproduce:
1. If there is any existing VM running in rhevm 3.3, try to edit its 'Operating System' tyep.
2. It will fail with the below error message:

===
Error while executing action:

rhel6-vm:

    There was an attempt to change VM values while the VM is not down. Please shut down the VM in order to modify these properties.
===


Actual results:
Fail to edit the VM's operating System type while its running.

Expected results:
Should be able to edit the VM's Operating System type while the VM is running.