Adds images support for Nova V3 API

Adds support for basic image querying from the image server
rather than the Nova API. The Nova V3 API no longer supports
image querying directly, but in order to support convenience
functions such as specifying images by name rather than ID,
it is necessary to have some basic image query support.

image delete and image meta manipulation is no longer supported
by the client as these features can be accessed directly through
the glance client

Partially implements blueprint v3-api

Change-Id: I9050845d631e9dfc2e110327221d154b8924cd65
Merge "Adds images support for Nova V3 API"