freeipa-server no longer supports i686 arch on F28
    
    389-ds-base 1.4 is going to drop 32bit i686 arch support in Fedora 28,
    https://bugzilla.redhat.com/show_bug.cgi?id=1530832 . Skip server
    related packages (freeipa-server, python[23]-ipaserver,
    freeipa-server-common, freeipa-server-dns, freeipa-server-trust-ad).
    
    RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1544386
    Fixes: https://pagure.io/freeipa/issue/7400
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>