The code was calling an unexisting function which never existed.
The module refers now to the correct `InferenceRuleManager`. It
also allows the compatibility with the future python-keystoneclient
in which the compatibility method will be removed from the
RoleManager.
Change-Id: I08f785dc9e840da2e16915683eecfe49189c44b3
Allow the user to create an inference rule between
two roles. The first, called the prior role
is the role explicitly assigned to an individual.
The second, called the implied role, is one that
the user gets implicitly. For example:
Role B implies Role A.
User X is assigned Role B.
Therefore User X also assigned Role A.
The management and maintenance of the rules is
performed in the Keystone server.
Change-Id: If547c2f16e812bc7fffd742ec37e6a26011f3185
