Renaming ShutdownSignals -> Shutdown (#1553)

util/signal/signal.go

@@ -6,7 +6,7 @@ import (
 )
 
 // ShutDownSingals returns all the singals that are being watched for to shut down services.
-func ShutdownSignals() []os.Signal {
+func Shutdown() []os.Signal {
 	return []os.Signal{
 		syscall.SIGTERM, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGKILL,
 	}