BGP nexthops and bug 700

RE-stable-0.99 RE-testing-0.99 summary
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               f813614         bgpd: fix parsing of OPEN options
               939b31d         bgpd: fix peer setup for option-less OPEN
               d30a912         bgpd: move shared code to zlookup_write_packet()
               08f2291         bgpd: factor some BNC code out
               8df60d6         bgpd: log debug message before bgp_scan() actions
               be659cc         doc: update the list of BGP debugging commands
               381d991         bgpd: implement "debug bgp nexthop" command
               99b8ede         bgpd: verify BGP nexthops' .rgate during each scan