cleanup pidfile handling
cleanup pidfile handling

graphite-project/carbon,obfuscurity/carbon,pratX/carbon,krux/carbon,mleinart/carbon,pratX/carbon,xadjmerripen/carbon,cbowman0/carbon,criteo-forks/carbon,benburry/carbon,graphite-server/carbon,criteo-forks/carbon,xadjmerripen/carbon,protochron/carbon,piotr1212/carbon,johnseekins/carbon,JeanFred/carbon,iain-buclaw-sociomantic/carbon,obfuscurity/carbon,kharandziuk/carbon,deniszh/carbon,JeanFred/carbon,graphite-project/carbon,kharandziuk/carbon,piotr1212/carbon,protochron/carbon,johnseekins/carbon,iain-buclaw-sociomantic/carbon,cbowman0/carbon,graphite-server/carbon,pu239ppy/carbon,benburry/carbon,pu239ppy/carbon,lyft/carbon,krux/carbon,lyft/carbon,mleinart/carbon,deniszh/carbon