linux-wpan radvd upstream

Hi wpan and bluetooth people,

Please review dev branch [0]. The important commit is the rework of the 6CO
support which is used by Bluetooth and 802.15.4 6LoWPAN.

Jukka, tell me if support for a common userspace application to sending
RA frames is okay for you.

I like to send a push request the next days to radvd repository.

btw:

We have now the layer for ndisc stuff and could think about to handle
6CO in userspace.

NOT the sending transmit of RA + 6CO, this isn't kernel job, but processing
RA frames with 6CO could be moved to kernel. The kernel take care for
context table only (overwrites by administration should always possible).

Anyway, I think we can still change it later if we want to move the
handling into kernelspace.

- Alex

[0] https://github.com/linux-wpan/radvd/commits/6lowpan