Inconsistency in the way live-sim works with scheme files

[zivnevo]

When using a scheme file:

• If using a global podList or resourceList and not setting a network-config-specific podList or resourceList - live-sim doesn't work (in the log it seems as if kube-dns was added, but in practice it is not added).
• If a network-config-specific podList or resourceList is set, live-sim works as expected.

Example

The two scheme files below produce different connectivity maps.

test.scheme.yaml - live-sim doesn't work

resourceList: tests/k8s_testcases/example_policies/online_boutique/new_online_boutique_manifests
networkConfigList:
  - name: test
    networkPolicyList:
      - tests/k8s_testcases/example_policies/online_boutique/synthesis_res_new_online_boutique.yaml

queries:
  - name: test-query
    connectivityMap:
      - test

test2.scheme.yaml - live-sim works

resourceList: tests/k8s_testcases/example_policies/online_boutique/new_online_boutique_manifests
networkConfigList:
  - name: test
    resourceList: tests/k8s_testcases/example_policies/online_boutique/new_online_boutique_manifests
    networkPolicyList:
      - tests/k8s_testcases/example_policies/online_boutique/synthesis_res_new_online_boutique.yaml

queries:
  - name: test-query
    connectivityMap:
      - test

[zivnevo]

A duplicate of #638, which has more details + an additional problem.