Not so gentle draining
This is a follow up of #11395 where we would like to kill the user job if the shutdown time of the worker node is approaching.
The idea I am playing with is to set a variable called GLIDEIN_PS_SiteWMS_WN_Preempt in check_wn_drainstate.sh when there are less than 30 minutes left before the shutdown time. Then this variable can be used to set GLIDEIN_PREEMPT_CONDITION . This is similar to what was done for #11395 where another variable (GLIDEIN_PS_WN_Draining) was used to set the STARt expression.