CRUD operations for federated protocols

Openstackclient needs to have a capability to manage federated protocols
(like saml2, openid connect, abfab). This patch allows users to
administrate such operations from the commandline.

Change-Id: I59eef2acdda60c7ec795d1bfe31e8e960b4478a1
Implements: bp/add-openstackclient-federation-crud
Merge "CRUD operations for federated protocols"