versioned object for cloudpulse updates for CloudPulse

Use OSLO library for versioned objects to support easy code upgrades. https://review.openstack.org/#/c/127532/ https://etherpad.openstack.org/p/kilo-crossproject-upgrades-and-versioning Versioned-objects will help deal with DB schema being at a different version than the code expects. This will allow cloudpulse ...