unit-test-app: fix test script error when handling multiple unit test configs in one config file:
unit-test-app: fix test script error when handling multiple unit test configs in one config file:

If we have multiple configs, we need to flash DUT with different binaries. But if we don't close DUT before apply new config, the old DUT will be reused, so new config name will not be applied.

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf