The oslo.policy Enforcer() object knows what to do with instances of
oslo.context RequestContext() if you pass it one.
This makes it easier for people to perform policy enforcement since they
don't need to map important authorization information from the context
object into a dictionary (historically called `creds`). This practiced
didn't guarantee any consistency in `creds` implementations.
You also don't need to call context.to_policy_values() anymore. The
oslo.policy library will do that for you under the hood and map context
values into a set of policy attributes it understands.
This commit updates the calls to enforcement to pass in the context
object where applicable.
Change-Id: Ife4ba098303088023e4341354a1e3bc9f378ce93
72044aaa85