[Multimodal][vl2l] Offline Scenario hangs at the end of the benchmark

[johncalesp]

The command:
mlperf-inf-mm-vl2l --settings.scenario offline --settings.mode performance_only
might hang if the expected qps is too high.

You can try:
mlperf-inf-mm-vl2l --settings.scenario offline --settings.mode performance_only --settings.offline_expected_qps 10
and check if you can reproduce.

[johncalesp]

@wangshangsam