Add logging for enforced policy rules

There are a lot of policy rules which should not necessarily
be explicitly specified in policy.json to be checked while enforcement.
There should be a way for an operator to know which policy rules are
actually being enforced for each action.

Added a unit test.

Change-Id: I261d3e230eced9ea514b35cc3f5f8be04f84c751
Closes-Bug: #1356679
Merge "Add logging for enforced policy rules"