Comment 7 for bug 806559

Discussed with Michael. This should be a fair approximation of what we want:

 if [ "$2" == "" && -n "$RELEASE_UPGRADE_IN_PROGRESS" ]; then
      # do not show question, i. e. priority medium
else
     # show question with high
fi

for lightdm. For gdm we need to not ask at all if RELEASE_UPGRADE_IN_PROGRESS