check whether replica exists before executing the domain level 1 deletion code
    
    Move this check before the parts that check topology suffix connectivity, wait
    for removed segments etc. If the hostname does not exist, it should really be
    one of the first errors user encounters during ipa-replica-manage del.
    
    https://fedorahosted.org/freeipa/ticket/5424
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>