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This adds the ability to send keystone authentified notifications using trusts. To do so, you specify the posted URL with the "trust+" prefix, and Zaqar will create and store a trust when subscribing to a queue, if the trust not provided in the subscription options It also add a capability to the webhook task to be able to send more structured data in the notification, allowing to include the Zaqar message in the data. blueprint mistral-notifications DocImpact Change-Id: I12b9c1b34cdd220fcf1bdc2720043d4a8f75dc85