central heating: implement stop setpoints

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
test 3007: use network setpoints

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
trigger: replace setpoints with inputs

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>