jc_utils: introduce running_tasks function.
jc_utils: introduce running_tasks function.

This function returns the list of the running tasks in a certain stage.

pombredanne/disco,pooya/disco,mozilla/disco,simudream/disco,discoproject/disco,oldmantaiter/disco,seabirdzh/disco,seabirdzh/disco,simudream/disco,beni55/disco,pombredanne/disco,pooya/disco,oldmantaiter/disco,mozilla/disco,pombredanne/disco,discoproject/disco,ktkt2009/disco,mozilla/disco,discoproject/disco,ktkt2009/disco,discoproject/disco,seabirdzh/disco,simudream/disco,ErikDubbelboer/disco,seabirdzh/disco,mwilliams3/disco,oldmantaiter/disco,mozilla/disco,pombredanne/disco,simudream/disco,ErikDubbelboer/disco,pooya/disco,mwilliams3/disco,mwilliams3/disco,ErikDubbelboer/disco,mwilliams3/disco,beni55/disco,beni55/disco,simudream/disco,oldmantaiter/disco,mwilliams3/disco,ktkt2009/disco,ErikDubbelboer/disco,seabirdzh/disco,ktkt2009/disco,discoproject/disco,ErikDubbelboer/disco,beni55/disco,oldmantaiter/disco,beni55/disco,pombredanne/disco,ktkt2009/disco,pooya/disco