Print Build finished instead of sucessful in nop

`nop` image/step used to be executed *only* when all the previous step
were done sucessfully. As we are not using init containers anymore,
this is not true, `nop` will always be executed even in case of
previous failure (after the others though).

Saying build successful is misleading, let's changed that to `finished`.

Signed-off-by: Vincent Demeester <[email protected]>

cmd/nop/main.go

@@ -19,5 +19,5 @@ package main
 import "fmt"
 
 func main() {
-	fmt.Println("Build successful")
+	fmt.Println("Build finished")
 }