`oc new-app` does not propagate containerPort information to the deployment if import-mode is PreserveOriginal

When creating a deployment with `oc new-app` and using `--import-mode=PreserveOriginal`, if there are containerports that are present in the dockerfile, they do not get propagated to the deployment `spec.containers[i].ports[i].containerPort`.

On further inspection this is because the config object which gets passed from the image to the deployment does not contain these details. The image reference in this case is a manifestlisted image which does not contain the docker metadata. Instead these need to be derived from the child manifest.