Improve control of the worker node draining, avoiding to stop accepting jobs as soon as the draining file is present
Site admins can control WN draining by dropping a file named "shutdowntime" in the MJF directory.
As soon as the file is there and noticed by the MJF startd_cron script the glidein stops accepting new jobs and quits when the time arrives.
Site admins would like to drop the file far in advance (weeks some time) and have the glidein stop accepting jobs only when the time gets close to the one indicated.
Not as soon as the file is present