Merge pull request #7066 from haukepetersen/add_net_l2filter

Makefile.dep

cpu/native/netdev_tap/netdev_tap.c

drivers/include/net/netdev.h

drivers/netdev_eth/netdev_eth.c

drivers/netdev_ieee802154/netdev_ieee802154.c

makefiles/pseudomodules.inc.mk

sys/Makefile

sys/include/net/l2filter.h

sys/include/net/netopt.h

sys/net/crosslayer/netopt/netopt.c

sys/net/gnrc/link_layer/netdev/gnrc_netdev_eth.c

sys/net/gnrc/link_layer/netdev/gnrc_netdev_ieee802154.c

sys/net/link_layer/l2filter/Makefile

sys/net/link_layer/l2filter/l2filter.c

sys/shell/commands/sc_netif.c