feat: integrate shard storage with transport

This patch refines the interface and storage implementation defined in
the last patch and integrates it with the transport layer.

A few updates have been made:
- 'name' -> 'href' for listing shards
- limiting, markers, and detailed are all used
- use of common_utils.fields to clean up shards transport PATCH
- add missing init for schemas
- fix schema issues found: 'location' -> 'uri', __init__.py
- shard resource correctly implements PUT semantics (replaces)

Transport: the admin API concept has been expanded to include
functionality from the public interface *in addition* to admin
functionality. Part of the rationale behind this is to simplify unit
testing. The other part of this is that an admin should be able to do
everything a normal user can do in addition to their special
functions.

Storage: now divided into control and data plane. The bootstrap passes
a control driver down to the transport which *can* be used for
endpoints as needed.

A test suite has been added that exercises the functionality from the
transport side of the shard registry resource.

Finally, the way the FaultyStorage driver tests were handled was
changed. Something about the setattr magic in that suite's setup made
it such that *all* tests would use the Faulty storage driver. This is
possibly related to the use of lazy_property decorators. To address
this issue, this patch promotes the faulty storage driver to setup.cfg
visibility and removes the setattrs.

Change-Id: I5b8cdb3a11d29422762b52f1e15e33167eecb867
Partitally-implements: blueprint storage-sharding
Partially-Closes: 1241686
Closes-Bug: 1243898
feat: add catalogue storage driver for queues

The upcoming sharding feature requires a catalogue storage driver very
similar to that used by the proxy. This patch ports the proxy
catalogue storage driver to the queues storage space and updates the
semantics accordingly. Specifically, the queues catalogue maintains a
mapping from project/queue to shard identifier.

Unit tests and helpers have been updated accordingly. The sqlite
portion of this is still to be done, and is reserved for a future
patch.

The faulty storage drivers has been given the appropriate
catalogue_controller impls.

Furthermore, minor py3k updates were added: metaclass using
six.add_metaclass.

Change-Id: I380d028520e9a712064810a15e2c6576de67e485
Partially-implements: blueprint storage-sharding
Closes-Bug: #1241686