Add Display Quotas action to Special:NovaProject

Work in progress. Allow project admins to see quota information
about their project. Will show quota type with used/available
information about that quota type.

Adds nova api call which returns a OpenStackNovaProjectLimits
object. The object contains relevant limit information. This
object can be used elsewhere; for instance: it can be used to
inform a user selecting a specific instance type will place
them over quota.

Change-Id: I23907f6d35d65ad6d3a4a6d139aa917e6b20c894
Merge "Add Display Quotas action to Special:NovaProject"