timedated: replace systemd-timedated-ntp.target logic with simpler scheme
The previous systemd-timedated-ntp.target was suffering by the problem that NTP implementations enabled via the machanism could not be disabled the obvious way on the "systemctl disable" command line. Replace systemd-timedated-ntp.target by a list of implementations we try in turn. The list is encoded in $pkgdatadir/ntp-units.
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