src/sys/modules/netgraph/ether_echo, branch upstream/10.4.0

src/sys/modules/netgraph/ether_echo, branch upstream/10.4.0 FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=upstream%2F10.4.0 2008-12-25T00:01:29Z Add a trivial node to reflect ethernet frames to whence they came. 2008-12-25T00:01:29Z Julian Elischer julian@FreeBSD.org 2008-12-25T00:01:29Z urn:sha1:a0b51976206f8b31401be207c9fd647e492eeac9 MFC after: 1 month