Description of role configuration options

Configuration option = Default value	Description
[role]
cache_time = None	(IntOpt) TTL (in seconds) to cache role data. This has no effect unless global caching is enabled.
caching = True	(BoolOpt) Toggle for role caching. This has no effect unless global caching is enabled.
driver = None	(StrOpt) Entrypoint for the role backend driver in the keystone.role namespace.
list_limit = None	(IntOpt) Maximum number of entities that will be returned in a role collection.