Patch to fix BGP ghost routes resulting from loops

[Ivo Smits]

I've created attached patches to prevent BGP route loops from turning 
into ghosts (issue reported earlier to the mailing list: 
http://marc.info/?l=bird-users&m=129433651229774&w=2).

Instead of completely ignoring received BGP routes containing the 
router's own AS number, it should now handle them as if the prefixes are 
unreachable.

We have tested the patch against git and it fixed the issue there. I've 
also made an (untested) patch against bird 1.2.5.

--
Ivo
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