When deploying a disconnected cluster, creating the iso by "openshifit-install agent create image" is failing (authentication required), when the release image resides in a secured local-registry.
Actually the issue is this:
openshift-install generates registry-config out of the install-config.yaml, and it's only the local regustry credentials (disconnected deploy), but it's not creating an icsp-file to get the image from local registry.      

    Run an agent-based iso image creation of a disconnected clutser. choose a version (nightly), where the image is in secured registry (such as registry.ci).  it will fail on authentication required.

    1.openshift-install agant create image
    2.
    3.
    

failing on authentication required    

    iso to be created