use Excecutable instead of exec for editing licenses (#11968)
use Excecutable instead of exec for editing licenses (#11968)

* fix defunct editor exit in #11691 
LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack