Comment 8 for bug 1202952

I think some of the higher up code expects the 'expires' key in the revocation list dicts when the list is requested. Fix looks good to me otherwise.

Looks like the KVS backend is fixed on master:
https://github.com/openstack/keystone/commit/efc30beab10faf4720a96322adb135726662b025#L1R46
Date: Wed May 8 10:51:27 2013 +1000