We may able to use chrony setup script on future version of RHEL/CentOS,
it better to run chrony setup when RHEL version >= 8, not only 8.
Note that on Fedora it still provides ntp/ntpdate package, so we run
ntp setup on it for now. (same on debian variants)
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <20191203192812.5861-1-syuu@scylladb.com>