Config value for revocation list timeout

Adds the config option 'revocation_cache_time'
default of 300 seconds, same as token timeout

Bug 1076083

DocImpact

Change-Id: Ifd41c816dd5431f140461d6a1588364d7ecf9a62
Fix v3 with UUID and memcache expiring.

- Regenerate tokens to change expires in expires_at.

Change-Id: Iaa62dca50d34a228e4850b59d263b807c5ee3549