dlio_benchmark_test.py segfaults on second benchmark test

[krehm]

Commit fb762c286f448b439fd230a7a79e5a57b9efa11d added MPI init and finalize calls in each test in dlio_benchmark_test.py. On my test setup this causes dlio_benchmark_test.py to segfault as it starts the second benchmark test. It appears that the MPI finalize must somehow unmap some memory that is needed for the subsequent MPI calls.

OS is Rocky 8.9, openmpi is 4.1.7a1 release 1.2310055 installed as part of MOFED 23.10-OFED.23.10.0.5.5.1