Similar to the DHCP dispatcher, add a variable for the chronyc
executable path, which can be overwritten more easily by
downstream packages if needed.
Also give an `.onoffline` suffix to more clearly differentiate
this script from `chrony.nm-dispatcher.dhcp`.
export LC_ALL=C
+chronyc=/usr/bin/chronyc
+
# For NetworkManager consider only up/down events
[ $# -ge 2 ] && [ "$2" != "up" ] && [ "$2" != "down" ] && exit 0
# Note: for networkd-dispatcher routable.d ~= on and off.d ~= off
-chronyc onoffline > /dev/null 2>&1
+$chronyc onoffline > /dev/null 2>&1
exit 0