Resolves: rhbz#1574778 - sssd fails to download known_hosts from freeipa
    
    Patch 0018-sysdb-custom-completely-replace-old-object-instead-o.patch
    caused a regression, caught by lslebodn and reported by a few users.
    
    Let's comment out this patch for now and uncomment it when we have a fix
    that do not cause a regression.
    
    Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>