copy_schema_to_ca: Fallback to old import location for ipaplatform.services
    
    This file is copied to older servers that might not have the ipaplatform
    refactoring.
    Import from the old location if the new one is not available.
    
    https://fedorahosted.org/freeipa/ticket/4763
    
    Reviewed-By: Tomas Babej <tbabej@redhat.com>