Create a reset for serial console
Hello,
You will find different commits that handles a way to perform a reset on serial link.
Some tests are updated and a new variable must_use_connection is created to handle the MPS device that must use connection_flag/list/commands.
Note : This MR depends on failure_retry one (!1495 (merged)) that will allows to customize the number of reset.
Thank you in advance for your review!
Best regards, Mylène