apiversions unit tests.

ExtractAPIVersions takes a collection page, extracts all of the elements, and returns them a slice of APIVersion structs.

ExtractVersionResources accepts a Page struct, specifically a APIVersionResourcePage struct, and extracts the elements into a slice of APIVersionResource structs.

ListVersionResources lists all of the different API resources for a particular API versions.

ListVersions lists all the Neutron API versions available to end-users.

APIVersion represents an API version for Neutron.

APIVersionPage is the page returned by a pager when traversing over a collection of API versions.

APIVersionResource represents a generic API resource.

APIVersionResourcePage is a concrete type which embeds the common SinglePageBase struct, and is used when traversing API versions collections.