Enable UUID token format vs PKI

PKI is good when you have a lot of clients, and want to offload
to the client side vs server validation.  We should use PKI down
the road, but requires syncing of /etc/keystone/ssl/.  Lets use
UUID for now, which allows auth to work properly accross our
haproxy keystones.

Also, allows us to remove the huge memcache system library hack.