Add release notes for M-3

- New service actions support, remove the separated ones.
- Workflow sharing feature.
- Usage of workflow UUID.

Change-Id: Ia082fc0b70dbad62e1224e8ebe252677d5372c3a

releasenotes/notes/new-service-actions-support-47279bd649732632.yaml

@@ -0,0 +1,11 @@
+---
+prelude: >
+   Actions of several OpenStack services are supported out of the box in
+   Mitaka, including Barbican, Cinder(V2), Swift, Trove, Zaqar and Mistral.
+upgrade:
+  - During an upgrade to Mitaka, operators or administrators need to run
+    ``python tools/get_action_list.py <service name>`` command to generate
+    service action names and values for updating
+    ``mistral/actions/openstack/mapping.json``, then, run
+    ``python tools/sync_db.py`` to populate database. Please note, some
+    services like Neutron, Swift, Zaqar don't support the command yet.

releasenotes/notes/support-barbican-0ac77ff11bde19d3.yaml

@@ -1,4 +0,0 @@
----
-prelude: >
-   Mistral now supports Barbican actions in workbook or workflow.
-

releasenotes/notes/support-cinder-v2-29deecbd1b35f823.yaml

@@ -1,4 +0,0 @@
----
-prelude: >
-    Cinder V1 API has been deprecated since Juno dev cycle, and will be
-    removed in future, Mistral will support Cinder V2 API from Mitaka release.

releasenotes/notes/support-swift-8b35bfbc1e927615.yaml

@@ -1,3 +0,0 @@
----
-prelude: >
-    Mistral now supports Swift actions in workbook or workflow.

releasenotes/notes/support-trove-534a1402e88f5e55.yaml

@@ -1,8 +0,0 @@
----
-prelude: >
-    Mistral now supports Trove actions in workbook or workflow.
-upgrade:
-  - During an upgrade to Mitaka, operators or administrators must use
-    ``python tools/get_action_list.py trove`` command to generate trove action
-    names and values for updating ``mistral/actions/openstack/mapping.json``,
-    then, perform ``python tools/sync_db.py`` to populate database.

releasenotes/notes/use-workflow-uuid-30d5e51c6ac57f1d.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - Usage of workflow name in the system(e.g. creating executions/cron-triggers
+    , workfow CRUD operations, etc.) is deprecated, please use workflow UUID
+    instead. The workflow sharing feature can only be used with workflow UUID.

releasenotes/notes/workflow-sharing-746255cda20c48d2.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    Add support for `workflow sharing`_ feature. users of one project can share
+    workflows to other projects using this feature.
+
+    .. _workflow sharing: https://specs.openstack.org/openstack/mistral-specs/specs/mitaka/approved/mistral-workflow-resource-sharing.html