Adds policy evaluation cache db table for use by policy engine in 0.3.1. No functional change, only db.
Adds policy evaluation cache db table for use by policy engine in 0.3.1. No functional change, only db.

The functional changes for policy evalution caching in the policy engine are expected to land post 0.3.0.
This ensures that the db structure is already in place so no db upgrade is needed.

Signed-off-by: Zach Hill <9de8c4480303b5335cd2a33eefe814615ba3612a@anchore.com>

anchore/anchore-engine,anchore/anchore-engine,anchore/anchore-engine