TEST: MPI script enhancements
TEST: MPI script enhancements

+ support arguments with spaces.
+ detect new OpenMPI.

shssf/ucx,sergsagal1/ucx_rocm,abouteiller/ucx,abouteiller/ucx,abouteiller/ucx,shssf/ucx,sergsagal1/ucx_rocm,manjugv/ucx,sergsagal1/ucx_rocm,manjugv/ucx,shssf/ucx,manjugv/ucx,abouteiller/ucx