deployment: extend the shutdownDeployment to also check for a shutdownDeployment program

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
deployment: fixed shutdown ready check

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
Merge branch 'fix-depl-script-shutdown' into next