Change ddfs_gc back to normal priority from low priority, to ensure that GC'ing does not starve when master is under heavy load
Change ddfs_gc back to normal priority from low priority, to ensure that GC'ing does not starve when master is under heavy load

related to issue #268

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