native/freebsd: fix tapsetup permission
native/freebsd: fix usecond typdef
nativenet: Apply coding conventions
nativenet: Supply net_dev_t support for nativenet
netdev.tests: Remove unneccessary #ifndef path
Merge pull request #1732 from authmillenon/netdev-nativenet

nativenet: Port nativenet for netdev
Merge pull request #1780 from LudwigOrtmann/native-freebsd-fixup

sys/posix: FreeBSD fixup