cmd/scollector: Improve Clean error messages
cmd/scollector: Improve Clean error messages

fixes #105

briantist/bosun,yyljlyy/bosun,augporto/bosun,bosun-sharklasers/bosun,eMerzh/bosun,leapar/bosun,dimamedvedev/bosun,mehulkar/bosun,mehulkar/bosun,eMerzh/bosun,cyngn/bosun,cyngn/bosun,mnikhil-git/bosun,madhukarreddy/bosun,inkel/bosun,influxdb/bosun,trigrass2/bosun,Skyscanner/bosun,couchand/bosun,dbirchak/bosun,melifaro/bosun,snowsnail/bosun,vitorboschi/bosun,jareksm/bosun,GROpenSourceDev/bosun,simnv/bosun,bosun-sharklasers/bosun,CheRuisiBesares/bosun,TrentScholl/bosun,influxdb/bosun,jareksm/bosun,objStorage/bosun,noblehng/bosun,influxdata/bosun,objStorage/bosun,treejames/bosun,madhukarreddy/bosun,treejames/bosun,bookingcom/bosun,evgeny-potapov/bosun,csmith-palantir/bosun,shanemadden/bosun,bridgewell/bosun,azhurbilo/bosun,leapar/bosun,alienth/bosun,azhurbilo/bosun,bosun-sharklasers/bosun,gregdel/bosun,mhenderson-so/bosun,GROpenSourceDev/bosun,azhurbilo/bosun,Skyscanner/bosun,jareksm/bosun,mehulkar/bosun,couchand/bosun,gregdel/bosun,eMerzh/bosun,evgeny-potapov/bosun,mnikhil-git/bosun,SlashmanX/bosun,dieface/bosun,noblehng/bosun,GROpenSourceDev/bosun,cazacugmihai/bosun,dimamedvedev/bosun,seekingalpha/bosun,seekingalpha/bosun,bosun-monitor/bosun,bridgewell/bosun,mhenderson-so/bosun,dieface/bosun,dbirchak/bosun,csmith-palantir/bosun,briantist/bosun,influxdata/bosun,mathpl/bosun,dimamedvedev/bosun,TrentScholl/bosun,simnv/bosun,gregdel/bosun,melifaro/bosun,dieface/bosun,mnikhil-git/bosun,simnv/bosun,mhenderson-so/bosun,snowsnail/bosun,bridgewell/bosun,snowsnail/bosun,SlashmanX/bosun,mxk1235/bosun,trigrass2/bosun,mathpl/bosun,eMerzh/bosun,bookingcom/bosun,couchand/bosun,evgeny-potapov/bosun,azhurbilo/bosun,eMerzh/bosun,dbirchak/bosun,alienth/bosun,jareksm/bosun,briantist/bosun,mathpl/bosun,augporto/bosun,influxdb/bosun,cazacugmihai/bosun,noblehng/bosun,Skyscanner/bosun,treejames/bosun,inkel/bosun,csmith-palantir/bosun,bookingcom/bosun,mxk1235/bosun,inkel/bosun,briantist/bosun,noblehng/bosun,fisdap/bosun,trigrass2/bosun,bosun-sharklasers/bosun,noblehng/bosun,yyljlyy/bosun,Skyscanner/bosun,simnv/bosun,vitorboschi/bosun,leapar/bosun,fisdap/bosun,mxk1235/bosun,trigrass2/bosun,leapar/bosun,dbirchak/bosun,influxdata/bosun,bookingcom/bosun,mhenderson-so/bosun,briantist/bosun,yyljlyy/bosun,melifaro/bosun,simnv/bosun,couchand/bosun,youngl98/bosun,mathpl/bosun,CheRuisiBesares/bosun,treejames/bosun,leapar/bosun,dbirchak/bosun,cyngn/bosun,noblehng/bosun,mehulkar/bosun,SlashmanX/bosun,cazacugmihai/bosun,TrentScholl/bosun,bosun-sharklasers/bosun,bridgewell/bosun,yyljlyy/bosun,cazacugmihai/bosun,csmith-palantir/bosun,seekingalpha/bosun,augporto/bosun,augporto/bosun,augporto/bosun,couchand/bosun,bosun-monitor/bosun,CheRuisiBesares/bosun,dimamedvedev/bosun,gregdel/bosun,youngl98/bosun,dimamedvedev/bosun,seekingalpha/bosun,madhukarreddy/bosun,youngl98/bosun,bookingcom/bosun,mxk1235/bosun,mnikhil-git/bosun,shanemadden/bosun,seekingalpha/bosun,csmith-palantir/bosun,dieface/bosun,TrentScholl/bosun,bosun-monitor/bosun,evgeny-potapov/bosun,cazacugmihai/bosun,influxdata/bosun,melifaro/bosun,bosun-monitor/bosun,GROpenSourceDev/bosun,seekingalpha/bosun,treejames/bosun,leapar/bosun,madhukarreddy/bosun,influxdb/bosun,melifaro/bosun,shanemadden/bosun,inkel/bosun,mathpl/bosun,Skyscanner/bosun,treejames/bosun,augporto/bosun,vitorboschi/bosun,shanemadden/bosun,cyngn/bosun,shanemadden/bosun,youngl98/bosun,shanemadden/bosun,CheRuisiBesares/bosun,mehulkar/bosun,fisdap/bosun,bridgewell/bosun,GROpenSourceDev/bosun,snowsnail/bosun,bosun-monitor/bosun,dimamedvedev/bosun,jareksm/bosun,influxdata/bosun,objStorage/bosun,alienth/bosun,bosun-monitor/bosun,GROpenSourceDev/bosun,CheRuisiBesares/bosun,cyngn/bosun,trigrass2/bosun,influxdata/bosun,mhenderson-so/bosun,cazacugmihai/bosun,mathpl/bosun,TrentScholl/bosun,SlashmanX/bosun,objStorage/bosun,fisdap/bosun,objStorage/bosun,yyljlyy/bosun,fisdap/bosun,trigrass2/bosun,youngl98/bosun,bookingcom/bosun,CheRuisiBesares/bosun,fisdap/bosun,gregdel/bosun,evgeny-potapov/bosun,yyljlyy/bosun,couchand/bosun,csmith-palantir/bosun,melifaro/bosun,mxk1235/bosun,snowsnail/bosun,mxk1235/bosun,cyngn/bosun,eMerzh/bosun,influxdb/bosun,simnv/bosun,mhenderson-so/bosun,dieface/bosun,influxdb/bosun,inkel/bosun,alienth/bosun,gregdel/bosun,dbirchak/bosun,azhurbilo/bosun,madhukarreddy/bosun,snowsnail/bosun,inkel/bosun,TrentScholl/bosun,madhukarreddy/bosun,azhurbilo/bosun,vitorboschi/bosun,bosun-sharklasers/bosun,objStorage/bosun,mehulkar/bosun,jareksm/bosun,vitorboschi/bosun,dieface/bosun,SlashmanX/bosun,vitorboschi/bosun,briantist/bosun,alienth/bosun,mnikhil-git/bosun,youngl98/bosun,alienth/bosun,Skyscanner/bosun,evgeny-potapov/bosun,bridgewell/bosun,mnikhil-git/bosun,SlashmanX/bosun