Resolve import dependency in consoleauth service

If you attempt to access an instance's noVNC console on the
horizon dashboard, an AttributeError is thrown, complaining
about 'module' object having no attribute 'InstanceInfoCache'.
This is because the objects are not registered by the consoleauth
service. This patch fixes this import dependency by registering
all objects so it could be used by the consoleauth service.

Change-Id: I4f9b922a077076b156833590762106d5cd2ad276
Closes-Bug: #1337447
Merge "Resolve import dependency in consoleauth service"