RBAC Support for Ceilometer API Implementation

This patch adds policy based Role Based Access Control
to the Ceilometer V2 APIs.

Validation/Enforcement of the policy is executed for the
different controllers and hence it is possible to
granularly control access.

Co-Authored-By: Fabio Giannetti <fabio.giannetti@hp.com>

Change-Id: I788b9b31c8cfba9f3caa19f1f6d465a3f81101ad
Merge "RBAC Support for Ceilometer API Implementation"