Add --drain option to jobsub_tools
Muon g-2 GCSO
Provide a functionality in jobsub tools that let users mark their jobs if they can be drained or can be killed during the downtimes.
--drain should result in a line in JDF as
+Drain = True
Default behavior: Do not drain i.e let the jobs run until the downtime and will be killed during the downtime. Should result in the line in JDF as
+Drain = False
GCSO can use this field in the jobs classad to take appropriate action