Description of problem:
Exclusion of networkpolicy doesn't work.

Version-Release number of selected component (if applicable):
OCP 3.11 to OCP 4.6

How reproducible:
Very.

Steps to Reproduce:
Edit config to exclude networkpolicy:

~~~
spec:
  azure_resource_group: ""
  cluster_name: host
  excludedResources:
  - networkpolicies
...
~~~

Actual results:

Migration controller is checking the network policies in destination:

~~~
host/namespaces/openshift-migration/pods/migration-controller-54c5d5fd67-8cptk/mtc/mtc/logs/current.log:2021-09-30T14:37:08.333165477Z 
2021-09-30T14:37:08.333165477Z {"level":"info","ts":1633012628333,"logger":"migration|fz87j","msg":"Rollback: Searching destination cluster namespace for resources with migrated-by label.","migMigration":"d173ae10-21fb-11ec-b6f0-a9f7b0ef8f58","phase":"DeleteMigrated","namespace":"test-mtc-pv-small","gvk":"networking.k8s.io/v1/networkpolicies","label":"migration.openshift.io/migrated-by-migplan:2f842f08-1782-446a-bd50-7302cdf24b3d"}
2021-09-30T14:38:00.633300295Z {"level":"info","ts":1633012680633,"logger":"migration|w4qtd","msg":"Rollback: Checking for leftover resources in destination cluster","migMigration":"d173ae10-21fb-11ec-b6f0-a9f7b0ef8f58","gvk":"networking.k8s.io/v1/networkpolicies","namespace":"test-mtc-pv-small"}
~~~

migration controller pod does not seem to be updated correctly, it is still pointing to default excluded resources and not including networkpolicies:

~~~
spec:
  containers:

command:

/manager
env:

name: EXCLUDED_RESOURCES
value: imagetags,templateinstances,clusterserviceversions,packagemanifests,subscriptions,servicebrokers,servicebindings,serviceclasses,serviceinstances,serviceplans,operatorgroups,events
~~~

Expected results:
Network policy successfully excluded.