cmd/bosun: fix issue with /api/egraph where closing svg tag was missing
cmd/bosun: fix issue with /api/egraph where closing svg tag was missing

fixes #1325

augporto/bosun,bosun-sharklasers/bosun,alienth/bosun,influxdata/bosun,evgeny-potapov/bosun,mnikhil-git/bosun,alienth/bosun,augporto/bosun,CheRuisiBesares/bosun,Skyscanner/bosun,CheRuisiBesares/bosun,noblehng/bosun,bookingcom/bosun,mnikhil-git/bosun,bookingcom/bosun,evgeny-potapov/bosun,GROpenSourceDev/bosun,influxdb/bosun,GROpenSourceDev/bosun,alienth/bosun,influxdata/bosun,mnikhil-git/bosun,leapar/bosun,simnv/bosun,csmith-palantir/bosun,melifaro/bosun,madhukarreddy/bosun,melifaro/bosun,augporto/bosun,madhukarreddy/bosun,Skyscanner/bosun,evgeny-potapov/bosun,CheRuisiBesares/bosun,mnikhil-git/bosun,bosun-sharklasers/bosun,influxdata/bosun,leapar/bosun,gregdel/bosun,noblehng/bosun,csmith-palantir/bosun,mhenderson-so/bosun,influxdb/bosun,seekingalpha/bosun,gregdel/bosun,madhukarreddy/bosun,madhukarreddy/bosun,Skyscanner/bosun,bosun-monitor/bosun,Skyscanner/bosun,bosun-monitor/bosun,jareksm/bosun,CheRuisiBesares/bosun,bosun-monitor/bosun,leapar/bosun,melifaro/bosun,simnv/bosun,simnv/bosun,noblehng/bosun,simnv/bosun,mhenderson-so/bosun,influxdata/bosun,GROpenSourceDev/bosun,influxdb/bosun,alienth/bosun,shanemadden/bosun,leapar/bosun,influxdb/bosun,GROpenSourceDev/bosun,shanemadden/bosun,bosun-sharklasers/bosun,jareksm/bosun,simnv/bosun,seekingalpha/bosun,GROpenSourceDev/bosun,influxdata/bosun,mhenderson-so/bosun,TrentScholl/bosun,melifaro/bosun,bookingcom/bosun,influxdb/bosun,bosun-sharklasers/bosun,shanemadden/bosun,mnikhil-git/bosun,mhenderson-so/bosun,CheRuisiBesares/bosun,csmith-palantir/bosun,augporto/bosun,GROpenSourceDev/bosun,seekingalpha/bosun,Skyscanner/bosun,noblehng/bosun,TrentScholl/bosun,shanemadden/bosun,Skyscanner/bosun,jareksm/bosun,mhenderson-so/bosun,shanemadden/bosun,seekingalpha/bosun,gregdel/bosun,melifaro/bosun,madhukarreddy/bosun,bosun-sharklasers/bosun,seekingalpha/bosun,influxdata/bosun,seekingalpha/bosun,bosun-monitor/bosun,bosun-monitor/bosun,noblehng/bosun,leapar/bosun,jareksm/bosun,bookingcom/bosun,csmith-palantir/bosun,bookingcom/bosun,jareksm/bosun,mhenderson-so/bosun,gregdel/bosun,csmith-palantir/bosun,jareksm/bosun,leapar/bosun,TrentScholl/bosun,augporto/bosun,bosun-sharklasers/bosun,evgeny-potapov/bosun,CheRuisiBesares/bosun,csmith-palantir/bosun,TrentScholl/bosun,shanemadden/bosun,influxdb/bosun,alienth/bosun,melifaro/bosun,evgeny-potapov/bosun,alienth/bosun,bosun-monitor/bosun,TrentScholl/bosun,gregdel/bosun,gregdel/bosun,noblehng/bosun,augporto/bosun,bookingcom/bosun,TrentScholl/bosun,madhukarreddy/bosun,simnv/bosun,mnikhil-git/bosun,evgeny-potapov/bosun