cmd/bosun: squelched keys don't go unknown. (#1790)
cmd/bosun: squelched keys don't go unknown. (#1790)

Fixes #1577
GROpenSourceDev/bosun,augporto/bosun,augporto/bosun,alienth/bosun,mhenderson-so/bosun,TrentScholl/bosun,bookingcom/bosun,bosun-monitor/bosun,TrentScholl/bosun,TrentScholl/bosun,bookingcom/bosun,GROpenSourceDev/bosun,seekingalpha/bosun,bosun-monitor/bosun,Skyscanner/bosun,GROpenSourceDev/bosun,TrentScholl/bosun,mhenderson-so/bosun,bookingcom/bosun,TrentScholl/bosun,augporto/bosun,Skyscanner/bosun,leapar/bosun,alienth/bosun,bosun-monitor/bosun,mhenderson-so/bosun,simnv/bosun,augporto/bosun,simnv/bosun,leapar/bosun,seekingalpha/bosun,melifaro/bosun,bosun-monitor/bosun,csmith-palantir/bosun,simnv/bosun,alienth/bosun,leapar/bosun,augporto/bosun,GROpenSourceDev/bosun,leapar/bosun,bookingcom/bosun,Skyscanner/bosun,seekingalpha/bosun,mhenderson-so/bosun,bosun-monitor/bosun,Skyscanner/bosun,simnv/bosun,melifaro/bosun,alienth/bosun,seekingalpha/bosun,leapar/bosun,GROpenSourceDev/bosun,leapar/bosun,simnv/bosun,GROpenSourceDev/bosun,Skyscanner/bosun,csmith-palantir/bosun,TrentScholl/bosun,Skyscanner/bosun,melifaro/bosun,augporto/bosun,csmith-palantir/bosun,bookingcom/bosun,seekingalpha/bosun,seekingalpha/bosun,csmith-palantir/bosun,melifaro/bosun,bookingcom/bosun,alienth/bosun,melifaro/bosun,csmith-palantir/bosun,alienth/bosun,melifaro/bosun,bosun-monitor/bosun,simnv/bosun,mhenderson-so/bosun,csmith-palantir/bosun,mhenderson-so/bosun