Abstract procedures for IP address warnings
    
    Originaly there should be only two occurencees of this warning, one for
    server, one for client. But obviously is not possible with current
    installers to achive this goal, so I have to extract code to not mess
    with 5 times copy and paste.
    
    https://fedorahosted.org/freeipa/ticket/5814
    
    Reviewed-By: David Kupka <dkupka@redhat.com>