The quantum/api/v2/views.py module is replaced by is_visible
properties in the RESOURCE_ATTRIBUTE_MAP defined in
quantum/api/v2/attributes.py. Extensions are given the ability to add
extended attribute descriptions to this map during initialization,
allowing extended attributes to be implemented similarly to core
attributes in plugins.
Resolves bug 1023111.
Change-Id: Ic6e224d5d841b6a1d4d1c762d7306adaf91f7a2d