Description of problem:
DV Error message when trying to import without secret-headers shouldn't contain the stack trace


Version-Release number of selected component (if applicable):
4.12.0-682

How reproducible:
Always

Steps to Reproduce:

1. Create a VM, Stop it

2. Create a VMExport without specifying the tokenSecretRef:

$ cat vmexport-vm.yaml 
apiVersion: export.kubevirt.io/v1alpha1
kind: VirtualMachineExport
metadata:
    name: export-vm-object
spec:
    source:
        apiGroup: "kubevirt.io"
        kind: VirtualMachine
        name: vm-cirros-source


3. See VMExport certs and links are populated:

$ oc get vmexport export-vm-object -oyaml


3. Create a target VM using an internal link, without specifying the certConfigMap and secretExtraHeaders:

$ cat vm-target-internal-raw.yaml
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
  name: vm-cirros-target-1
  labels:
    kubevirt.io/vm: vm-cirros-target-1
spec:
  dataVolumeTemplates:
  - metadata:
      name: cirros-dv-target-1
    spec:
      storage:
        resources:
          requests:
            storage: 1Gi
        storageClassName: hostpath-csi-basic
      source:
        http:
          url: "https://virt-export-export-vm-object.default.svc/volumes/cirros-dv-source-ocs/disk.img"
          #     certConfigMap: "router-cert"
          #     secretExtraHeaders:
          #        - secret-headers
  running: true
  template:
    metadata:
      labels:
        kubevirt.io/vm: vm-cirros-target-1
    spec:
      domain:
        devices:
          disks:
          - disk:
              bus: virtio
            name: datavolumetarget
        machine:
          type: ""
        resources:
          requests:
            memory: 100M
      terminationGracePeriodSeconds: 0
      volumes:
      - dataVolume:
          name: cirros-dv-target-1
        name: datavolumetarget


Actual results:

$ oc get vm -A
NAMESPACE   NAME                   AGE   STATUS            READY
default     vm-cirros-source       41m   Stopped           False
default     vm-cirros-target-1     24m   DataVolumeError   False

$ oc describe dv cirros-dv-target-1 | grep Message
    Message:               PVC cirros-dv-target-1 Bound
    Message:               Unable to connect to http data source: Get "https://virt-export-export-vm-object.default.svc/volumes/cirros-dv-source-ocs/disk.img": x509: certificate signed by unknown authority HTTP request errored kubevirt.io/containerized-data-importer/pkg/importer.createHTTPReader   /remote-source/app/pkg/importer/http-datasource.go:326 kubevirt.io/containerized-data-importer/pkg/importer.NewHTTPDataSource   /remote-source/app/pkg/importer/http-datasource.go:100 main.newDataSource   /remote-source/app/cmd/cdi-importer/importer.go:255 main.handleImport   /remote-source/app/cmd/cdi-importer/importer.go:173 main.main   /remote-source/app/cmd/cdi-importer/importer.go:143 runtime.main   /usr/lib/golang/src/runtime/proc.go:250 runtime.goexit   /usr/lib/golang/src/runtime/asm_amd64.s:1594


Expected results:
The Error message shouldn't contain the stack trace