Description of problem:

template validator currently uses annotations for validation.

Based on the documentation (https://github.com/kubevirt/common-templates/tree/master/templates), the validation should be done based on labels, so the validator should be fixed to check under labels.


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


How reproducible:
100%

Steps to Reproduce:
1. Create a template file with template name and namespace under labels - template.yaml

apiVersion: template.openshift.io/v1
kind: Template
metadata:
  annotations:
    defaults.template.kubevirt.io/disk: rootdisk
    description: This template can be used to create a VM suitable for Red Hat Enterprise
      Linux 7 and newer. The template assumes that a PVC is available which is providing
      the necessary RHEL disk image.
    iconClass: icon-rhel
    name.os.template.kubevirt.io/rhel7.0: Red Hat Enterprise Linux 7.0
    name.os.template.kubevirt.io/rhel7.1: Red Hat Enterprise Linux 7.1
    name.os.template.kubevirt.io/rhel7.2: Red Hat Enterprise Linux 7.2
    name.os.template.kubevirt.io/rhel7.3: Red Hat Enterprise Linux 7.3
    name.os.template.kubevirt.io/rhel7.4: Red Hat Enterprise Linux 7.4
    name.os.template.kubevirt.io/rhel7.5: Red Hat Enterprise Linux 7.5
    name.os.template.kubevirt.io/rhel7.6: Red Hat Enterprise Linux 7.6
    openshift.io/display-name: Red Hat Enterprise Linux 7.0+ VM
    openshift.io/documentation-url: https://github.com/kubevirt/common-templates
    openshift.io/provider-display-name: KubeVirt
    openshift.io/support-url: https://github.com/kubevirt/common-templates/issues
    tags: kubevirt,virtualmachine,linux,rhel
    template.kubevirt.io/editable: |
      /objects[0].spec.template.spec.domain.cpu.sockets
      /objects[0].spec.template.spec.domain.cpu.cores
      /objects[0].spec.template.spec.domain.cpu.threads
      /objects[0].spec.template.spec.domain.resources.requests.memory
      /objects[0].spec.template.spec.domain.devices.disks
      /objects[0].spec.template.spec.volumes
      /objects[0].spec.template.spec.networks
    template.kubevirt.io/version: v1alpha1
    template.openshift.io/bindable: "false"
    validations: |
      [
        {
          "name": "minimal-required-memory",
          "path": "jsonpath::.spec.domain.resources.requests.memory",
          "rule": "integer",
          "message": "This VM requires more memory.",
          "min": 2147483648
        },
      ]
  creationTimestamp: 2019-09-19T13:00:03Z
  labels:
    flavor.template.kubevirt.io/tiny: "true"
    os.template.kubevirt.io/rhel7.0: "true"
    os.template.kubevirt.io/rhel7.1: "true"
    os.template.kubevirt.io/rhel7.2: "true"
    os.template.kubevirt.io/rhel7.3: "true"
    os.template.kubevirt.io/rhel7.4: "true"
    os.template.kubevirt.io/rhel7.5: "true"
    os.template.kubevirt.io/rhel7.6: "true"
    template.kubevirt.io/type: base
    workload.template.kubevirt.io/server: "true"
  name: rhel7-server-tiny-tmp
  namespace: openshift
  ownerReferences:
  - apiVersion: kubevirt.io/v1
    kind: KubevirtCommonTemplatesBundle
    name: common-templates-hyperconverged-cluster
    uid: 4d7cdf30-da31-11e9-9cda-fa163ec431b1
  resourceVersion: "900825"
  selfLink: /apis/template.openshift.io/v1/namespaces/openshift/templates/rhel7-server-tiny-tmp
  uid: 6594840c-dadd-11e9-a3fd-0a580a80002d
objects:
- apiVersion: kubevirt.io/v1alpha3
  kind: VirtualMachine
  metadata:
    labels:
      app: ${NAME}
      vm.kubevirt.io/template: rhel7-server-tiny-tmp
      vm.kubevirt.io/template-namespace: openshift
      vm.kubevirt.io/template.revision: "1"
      vm.kubevirt.io/template.version: v0.6.2
    name: ${NAME}
  spec:
    running: false
    template:
      metadata:
        labels:
          kubevirt.io/domain: ${NAME}
          kubevirt.io/size: tiny
      spec:
        domain:
          cpu:
            cores: 1
            sockets: 1
            threads: 1
          devices:
            disks:
            - disk:
                bus: virtio
              name: rootdisk
            - disk:
                bus: virtio
              name: cloudinitdisk
            interfaces:
            - bridge: {}
              name: default
            rng: {}
          resources:
            requests:
              memory: 1G
        evictionStrategy: LiveMigrate
        networks:
        - name: default
          pod: {}
        terminationGracePeriodSeconds: 0
        volumes:
        - name: rootdisk
          persistentVolumeClaim:
            claimName: ${PVCNAME}
        - cloudInitNoCloud:
            userData: |-
              #cloud-config
              password: redhat
              chpasswd: { expire: False }
          name: cloudinitdisk
parameters:
- description: VM name
  from: rhel7-[a-z0-9]{16}
  generate: expression
  name: NAME
- description: Name of the PVC with the disk image
  name: PVCNAME
  required: true

2. Create the template

oc create -f template.yaml -n openshift

3. Create a DV - oc create -f rhel-dv.yaml

apiVersion: cdi.kubevirt.io/v1alpha1
kind: DataVolume
metadata:
  name: rhel7
spec:
  source:
      http:
         url: "http://cnv-qe-server.rhevdev.lab.eng.rdu2.redhat.com/files/rhel-images/rhel-76/rhel-76.qcow2"
  pvc:
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: "25Gi"

4. Create a VM which uses the template and the pvc

oc process -n openshift rhel7-server-tiny-tmp -p NAME="test8" -p PVCNAME="rhel7" | oc create -n default  -f -

Actual results:
VM is created

Expected results:
VM creation should fail (memory validation should fail)

Additional info: