Append host if arguments are specified for ping input (#5450)

plugins/inputs/ping/ping.go

@@ -193,7 +193,7 @@ func hostPinger(binary string, timeout float64, args ...string) (string, error)
 // args returns the arguments for the 'ping' executable
 func (p *Ping) args(url string, system string) []string {
 	if len(p.Arguments) > 0 {
-		return p.Arguments
+		return append(p.Arguments, url)
 	}
 
 	// build the ping command args based on toml config