Recent versions of oslo policy allow the use of a policy.d to break up
policy in a more user understandable way. Nova is going to use this in
Kilo to break out v2 and v2.1 API policy definitions.
This provides a unified helper for installing sample policies. It
makes some assumptions on project directory structure. Porting other
projects to use this can happen in the future.
Change-Id: Iec23b095176332414faf76a9c329f8bb5f3aa6c3