certprofile: remove 'rename' option
    
    The initial fix of ticket 5247 rejected renames, but left the option
    behind for API compatibility.  Remove the option now, according to
    the consensus that because it never worked, it is fine to remove it.
    
    Fixes: https://fedorahosted.org/freeipa/ticket/5247
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>