Stop trying to move config from read-only config partition

There is some prehistoric code in the onboot script that allows to pass
initial hardwaremodel, rebootConfig and restartcounter files via /config
partition. However, as this partition became read-only, EVE is no longer
able to remove them once applied:

move /config/rebootConfig /persist/status
mv: cannot remove '/config/rebootConfig': Read-only file system

But while the file cannot be removed, mv command will manage to copy its
content to /persist. But this means that on every boot the current value
in /persist is overwritten with this initial content from /config.
This is very dangerous especially for rebootConfig. Device will end up
in endless reboot cycle: on every boot it will replace the last applied
reboot counter with whatever the initial value was set in /config,
which results in counter mismatch wrt. the reboot counter from device
config received from the controller.

I'm not aware of any practical value of setting initial values of these
files through /config, therefore I think this functionality can be
completely removed.

Signed-off-by: Milan Lenco <milan@zededa.com>
(cherry picked from commit c56cdb9)

pkg/pillar/scripts/onboot.sh

@@ -115,19 +115,6 @@ if [ ! -d $PERSISTDIR/status ]; then
     mkdir $PERSISTDIR/status
 fi
 
-if [ -f $CONFIGDIR/restartcounter ]; then
-    echo "$(date -Ins -u) move $CONFIGDIR/restartcounter $PERSISTDIR/status"
-    mv $CONFIGDIR/restartcounter $PERSISTDIR/status
-fi
-if [ -f $CONFIGDIR/rebootConfig ]; then
-    echo "$(date -Ins -u) move $CONFIGDIR/rebootConfig $PERSISTDIR/status"
-    mv $CONFIGDIR/rebootConfig $PERSISTDIR/status
-fi
-if [ -f $CONFIGDIR/hardwaremodel ]; then
-    echo "$(date -Ins -u) move $CONFIGDIR/hardwaremodel $PERSISTDIR/status"
-    mv $CONFIGDIR/hardwaremodel $PERSISTDIR/status
-fi
-
 # Checking for low diskspace at bootup. If used percentage of
 # /persist directory is more than 70% then we will remove the
 # following sub directories: