only query global scope addresses
only query global scope addresses

All the addresses we're interested in have 'global' scope according to
'ip' ('global' does not necessarily mean 'globally routable', as 10.x
ipv4 addresses having such a scope show).  previously, a link-local
address would show up for 'racknet/ip ... ipv6' for both 'public' and
'private' values of '...'.  After this change only valid addresses show
up.

rgbkrk/docker-rackspace-net