Adds basic servers support for the Nova V3 API

Ports servers support from the v1_1 directory omitting functionality
which is no longer supported directly in the V3 API such as:

- floating ip
- add/remove/list of security groups
- disk config related functionality

Makes the appropriate modifications required for parameter name
changes between the V2 and V3 API

Booting an instance is not yet supported as this will require more
extensive changes as image listing services are no longer proxied
through the Nova V3 API

Partially implements blueprint v3-api

Change-Id: I1116e8d8ebc73176223f4135168cc4ab5d904356
Merge "Adds basic servers support for the Nova V3 API"