examples: update NetworkManager dispatcher script

Replace most of the code with the new onoffline command.

examples/chrony.nm-dispatcher

@@ -10,32 +10,6 @@ export LC_ALL=C
 
 # Note: for networkd-dispatcher routable.d ~= on and off.d ~= off
 
-# Check if there is a default route
+chronyc onoffline > /dev/null 2>&1
-
-if /sbin/ip route list 2> /dev/null | grep -q '^default'; then
-  chronyc online > /dev/null 2>&1
-  exit 0
-fi
-
-sources=$(chronyc -c -n sources 2> /dev/null)
-
-[ $? -ne 0 ] && exit 0
-
-# Check each configured source if it has a route
-
-echo "$sources" | while IFS=, read mode state address rest; do
-  [ "$mode" != '^' ] && [ "$mode" != '=' ] && continue
-
-  /sbin/ip route get "$address" > /dev/null 2>&1 && command="online" || command="offline"
-
-  # Set priority of sources so that the selected source is set as
-  # last if offline to avoid unnecessary reselection
-  [ "$state" != '*' ] && priority=1 || priority=2
-
-  echo "$priority $command $address"
-
-done | sort | while read priority command address; do
-  echo "$command $address"
-done | chronyc > /dev/null 2>&1
 
 exit 0