Added policies and used policy enforcement engine
from monasca-common.
- Replaced security with oslo.policy
- Updated unit tests and implemented some new tests
- Added a new entry point for generating sample policy file by tox
story: 2001233
task: 6355
Change-Id: I4aa444fe6ec883160c03c201145c77994b6615f9
Signed-off-by: Amir Mofakhar <amofakhar@op5.com>