[PATCH] fix RTPROT_RA markup of some RA routes in netlink

Hello, list.

This is a small patch I have produced after thoroughly studying the coupling between addrconf and FIB6 functions. I believe this change to improve the transparency of FIB6 as viewed from userspace (by iproute2 in particular). It does resolve an issue I was debugging, where a default route derived from a router advertisement couldn't be told from kernel routes derived from other sources. The difference is meaningful at least for dynamic routing purposes, but other good uses are also possible.

Thank you.

-- 
    Denis Ovsienko