[standalone] only mutate check issued in standalone check definitions
[standalone] only mutate check issued in standalone check definitions

rbramwell/sensu,portertech/sensu,crewton/sensu,quodlibetor/sensu,keymone/sensu,javrasya/sensu,withnale/sensu,miyakawataku/sensu,upfluence/sensu,sensu/sensu,somic/sensu,m4ce/sensu,pauloconnor/sensu,npe9/sensu,cread/sensu,bf4/sensu,solarkennedy/sensu,roobert/sensu,yonglehou/sensu