openbench-logic-sniffer: add a function to handle reset command

openbench-logic-sniffer: add a function to handle reset command

Openbench Logic Sniffer reset is a little more complex than a simple send.
To avoid code duplication, this patch adds a new function dedicated to
this task.

Signed-off-by: Gwenhael Goavec-Merou <redacted>