odhcpd: multiple fixes

* Rewrite ndp proxy using kernel proxying
* Aid flash-renumbering in hybrid DHCPv6-mode
* Unicast RAs to RS senders
* Add support for router address

Signed-off-by: Steven Barth <steven@midlink.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42944 3c298f89-4303-0410-b956-a3cf2f4a3e73
x86_64: add kmod-r8169 to the default packages

This kmod is required by the Alix APU 1D4 to be reachable after
installing an x86-64 image.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42945 3c298f89-4303-0410-b956-a3cf2f4a3e73
Merge branch 'master' of git://git.openwrt.org/openwrt