Some of the flashing scripts try to be clever about picking unused
ports. That's convenient for the user, so add a helper class to
runner.core to accomplish similar ends portably.
Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
Factor the classes which do the work into a new "runner" package. This
package has a core module where ZephyrBinaryRunner and common helpers
will live, and one file per subclass / runner front-end.
The top-level script, zephyr_flash_debug.py, still exists, but just
delegates its work to the core.
Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
