Warn about potential loss of CA, KRA, DNSSEC during uninstall
    
    If connection do LDAP failed (or LDAP server is down) we cannot verify
    if there is any additonal instance of CA, KRA, DNSSEC master.
    In this case a user is warned and promted to confirm uninstallation.
    
    https://fedorahosted.org/freeipa/ticket/5544
    
    Reviewed-By: David Kupka <dkupka@redhat.com>