koji_builder / staging: drop ntp/ntpdate for f34
    
    Split out the koji_builder package installs so we can drop ntp/ntpdate
    for f34 (they were replaced by ntpsec and we use chrony anyhow).
    After we move prod to f34 we should merge these back.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>