Integrate the code to download and extract the peers list from BGP

It requires a copy of Marco d'Itri's zebra-dump-parser under bgp/

To be run with ./update.sh --bgp-only
Also sort the generated peers file
Handle braces in all parts of the zdp output

Needed as of the bgp dump of the 18th of January
In Oceania prefer mirrors in Australia and New Zealand

Rather than checking mirrors in the nearby, smaller, islands