[thci] allow to use Zephyr platforms (#7099)
[thci] allow to use Zephyr platforms (#7099)

On initialization, detect if the device is running Zephyr and in that
case modify the commands prefix and line ends.
openthread/openthread,abtink/openthread,abtink/openthread,srickardti/openthread,abtink/openthread,jwhui/openthread,srickardti/openthread,jwhui/openthread,openthread/openthread,openthread/openthread,srickardti/openthread,jwhui/openthread,abtink/openthread,srickardti/openthread,jwhui/openthread,openthread/openthread