Ports ips api to v3 API

Port the core ips api to the V3 API as plugins along
with the corresponding tests for the ips and servers API.

Partially implements blueprint v3-api-core-as-extensions

Change-Id: I6e9f8ab71745791e6bc18999810f39764cd40116
Only update cell capabilites once

Simple indent level fix

Change-Id: Ic137259f9461e767ecd256d9ac1297256bd9dbfe
Adds v3 API disable config option

Adds the ability to disable the v3 API and it is disabled by
default for now. The API is explictly enabled when running the
unittests though.

Change-Id: I34597d35b9739e06561579651f7ec72afa357919
Fixed two minor docs niggles.

The doc todo list didn't actually work, so remove it. Also, the
documentation is not written by Anso Labs quite so much anymore.

Change-Id: I746a26505d331ab55565e952a1a46425458b1412
Merge "Ports ips api to v3 API"
Merge "Fixed two minor docs niggles."
Merge "Adds v3 API disable config option"
Merge "Only update cell capabilites once"