[filters] handler filter and mutator value validation
[filters] handler filter and mutator value validation

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