Updated openstack/openstack
Project: openstack/cinder  caff15af26b7622b2d6f84765bbc0ba8434a24be
null
Serialize the notification payload

Notification payload in oslomessaging needs to be
serialized correctly, currently it's not.

Use json to encode the payload.
Closes-Bug: 1294949

Change-Id: Idb2c13981cc1c60ed02445a28220d1dab1529d2b