Adds first part of quotas support for Nova V3 API

Adds support and tests for the os-quotas extension
for the Nova V3 API. Note that compared to the V2
version this removes the ability to set quotas
which are not relevant to the V3 API (eg injected
file quotas are not relevant because the
os-personalities extension has been removed)

Partially implements blueprint v3-api

Change-Id: Ifa1c77428424bedf7fb88ef6d7b3843376799d24
Merge "Adds first part of quotas support for Nova V3 API"