Add debug logging to revocation event checking
Add debug logging to revocation event checking

Previously, the revocation matching engine was basically a black box
that seemed to mysteriously match some tokens and not others, and it was
difficult to understand why an event would match a given token at a
glance. Fixed.

Change-Id: I751d891dc1cec2bb22ad6a3948aafaa34fc835d1

rajalokan/keystone,mahak/keystone,rajalokan/keystone,openstack/keystone,rajalokan/keystone,ilay09/keystone,ilay09/keystone,mahak/keystone,openstack/keystone,mahak/keystone,ilay09/keystone,openstack/keystone