This patch adds infrastructure to store and verify json samples
about versioned notifications. Also it adds sample for the service.update
notification as that is the only existing versioned notification.
A new notification_sample_tests subtree added to the functional test
tree to verify that the emitted notifications match with the stored sample.
Partially-Implements: bp versioned-notification-api
Change-Id: I3a70b7b5d6d427611a9d2c1610e0d55aff88f0e8