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With this change, the zephyr port is tested against the standard test suite
via the following scheme:
- the zephyr port is built with the `qemu_cortex_m3` board and the
  `prj_minimal.conf` configuration
- `qemu-system-arm` runs `zephyr.elf`
- the zephyr console is redirected to a pts/pty
- `tests/run-tests.py` is run in bare-metal mode against the pts/pty device

This allows testing the zephyr port as though it were a physical board
attached over a serial port.
Signed-off-by: Damien George <damien@micropython.org>