Description of problem:
Common template name under objects -> metadata -> labels -> vm.kubevirt.io/template contains only a partial name of the actual template name.

When adding a namespace to the template (so that template validator would be used in CLI), VM creation fails.

Version-Release number of selected component (if applicable):
OCP 4.4.0-rc.2
CNV 2.3 (v0.26.3)

How reproducible:
100%

Steps to Reproduce:
1. Edit a common template - add under objects - > metadata -> labels:
vm.kubevirt.io/template.namespace: openshift

2. Create a VM which uses the edited template


Actual results:

In the template:
objects - > metadata -> labels -> vm.kubevirt.io/template = rhel7-server-tiny (template name is rhel7-server-tiny-v0.7.0)

VM creation fails on:

E           kubernetes.client.rest.ApiException: (400)
E           Reason: Bad Request
E           HTTP response headers: HTTPHeaderDict({'Audit-Id': '66d879b0-eda6-430a-8776-cffa7440d10c', 'Content-Type': 'application/json', 'Date': 'Mon, 23 Mar 2020 17:25:45 GMT', 'Content-Length': '241'})
E           HTTP response body: b'{"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"admission webhook \\"virt-template-admission.kubevirt.io\\" denied the request: missing parent template (key=openshift/rhel7-server-tiny) for rhel-7-6","code":400}\n'

Expected results:
VM creation should succeed.


Additional info:
Workaround - edit the template, set objects - > metadata -> labels -> vm.kubevirt.io/template = full template name (e.g rhel7-server-tiny-v0.7.0)
VM creation will succeed.