Make sure that timers are daemons

A pending timer shouldn't block the whole program from exiting.

Author: keysmashes

cwltool/job.py

@@ -534,6 +534,7 @@ def terminate():
                 except OSError:
                     pass
             tm = Timer(timelimit, terminate)
+            tm.daemon = True
             tm.start()
 
         rcode = sproc.wait()

cwltool/sandboxjs.py

@@ -181,6 +181,7 @@ def terminate():
         timeout = 20
 
     tm = threading.Timer(timeout, terminate)
+    tm.daemon = True
     tm.start()
 
     stdin_text = u""