atmega_common: add ENOTSUP and ECANCELED to errno.h
drivers: Provide basic interface for all network devices
tests: Add functionality test for netdev_base
Merge pull request #1492 from authmillenon/net-dev-base

drivers: Introduce a general interface for network device drivers
tests: fix netdev test
Merge pull request #1761 from authmillenon/netdev-fix

tests: fix netdev test
board/iot-lab_M3: fixed default terminal device