+++ This bug was initially created as a clone of Bug #1816230 +++

Description of problem:
When the controller is installed in a 3.9 cluster, all migrations fail

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

How reproducible:
Always

Steps to Reproduce:
1. Prepare 2 clusters to perform migrations. One of them must be version ocp3.9 and the other ocp4.3
2. Install the controller in the 3.9 cluster
3. Run any migration

Actual results:
The migration fails with this failure

$ oc get migmigration -o yaml
....
  status:
    conditions:
    - category: Advisory
      durable: true
      lastTransitionTime: 2020-03-23T15:22:45Z
      message: '[1] Stage pods created.'
      status: "True"
      type: StagePodsCreated
    - category: Critical
      lastTransitionTime: 2020-03-23T15:23:04Z
      message: 'Reconcile failed: [pods "restic-26mz2" is forbidden: User "system:serviceaccount:openshift-migration:migration-controller"
        cannot delete pods in the namespace "openshift-migration": User "system:serviceaccount:openshift-migration:migration-controller"
        cannot delete pods in project "openshift-migration"]. See controller logs
        for details.'
      status: "True"
      type: ReconcileFailed
    phase: RestartRestic



Expected results:
The migration should run without failures

Additional info: