Updated openstack/openstack
Project: openstack/nova  74dde98c753f1a216bfa37fbd67033e6d1cd3a2c
null
Serialize the notification payload in json

When a notification payload is passed to the oslo.messaging the
payload must be correctly serialized.

This change encode the payload into json as the old rpc did.

Closes bug: #1279881

Change-Id: I99fc2a4b0e0146c9faa6abeddbd15cb24169e024