[fix-write-pid] move pid_file and service back into default options constant
[fix-write-pid] move pid_file and service back into default options constant

upfluence/sensu,bf4/sensu,somic/sensu,portertech/sensu,javrasya/sensu,roobert/sensu,miyakawataku/sensu,disqus/sensu,solarkennedy/sensu,crewton/sensu,cread/sensu,pauloconnor/sensu,rbramwell/sensu,yonglehou/sensu,disqus/sensu,zuazo-forks/sensu,m4ce/sensu,npe9/sensu,quodlibetor/sensu,sensu/sensu,withnale/sensu,keymone/sensu,Tapjoy/sensu-mirror