[proxy] Return LISTs as arrays, rather than objects

[Allele Dev]

LIST /v1/partitions and LIST /v1/catalogue return an object of objects. It makes more sense to return an array of objects.

```current
{
  {"name": ...},
  {"name2": ...},
  ...
}
```

```desired
[
  {"name": ...},
  {"name2": ...},
  ...
]
```

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/49595

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/49595
Committed: http://github.com/openstack/marconi/commit/f59dd2d2d04e65ffd178a66b7aa71b36cfcfbbcd
Submitter: Jenkins
Branch: master

commit f59dd2d2d04e65ffd178a66b7aa71b36cfcfbbcd
Author: Zhihao Yuan <email address hidden>
Date: Wed Oct 2 16:45:47 2013 -0400

    feat(proxy): listing opts returns lists

    Closes-Bug: 1233277

    Change-Id: I46e021b04d8245002273db240bbe68f2e4457be7