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In my case (new install using Ubuntu Juju) the problem was that neutron was misconfigured with the wrong ip address for the metadata server.

This is good: http://techbackground.blogspot.ie/2013/06/metadata-via-dhcp-namespace.html

That pointed me at: root@neutron:/etc/neutron# cat metadata_agent.ini

    ...
  nova_metadata_ip = 192.168.100.151
  nova_metadata_port = 8775
    ...

I fixed the nova_metadata_ip adn restarted the neutron metadata service and that solved the issue.