Add instance's locked field and instance's
display_description field in InstancePayload.
Implements: bp additional-notification-fields-for-searchlight
Change-Id: Iceae25ca8a0d7f2e5f22cab1364215bda2fae93c
Instance.shutdown.start and instance.shutdown.end notifications
are transformed to the new versioned framework.
Change-Id: I01732837cf5a54ecd04b00771bac92c9864cd3b0
Implements: bp versioned-notification-transformation-ocata