Add cycle-highlights for Magnum Train 9.1.0

Change-Id: I0c281b0a62f2739bddfb4c35de3572d255eb3306

deliverables/train/magnum.yaml

@@ -5,6 +5,25 @@ team: magnum
 type: service
 repository-settings:
   openstack/magnum: {}
+cycle-highlights:
+  - Fedora CoreOS driver is now available which we are please to offer since
+    Fedora Atomic will be end of life at the end of this November. We welcome
+    users to test and provide feedback for this driver.
+  - Node groups now allow users to create clusters with groups of nodes with
+    different specs, e.g. GPU node groups and high memory node groups. Thanks
+    for the great work from CERN team and StackHPC.
+  - Rolling upgrade is available for both Kubernetes version and the node
+    operating system with minimal downtime.
+  - Auto healing can be deployed on Kubernetes cluster to monitor the cluster
+    health and replace broken nodes when failure is detected.
+  - Boot Kubernetes cluster from volumes and configurable volume types.
+    They can even set the volume type etcd volumes. This may be useful for
+    cloud providers who want to use SSDs, NVMEs, etc.
+  - Private cluster can be created following best security practices, isolating
+    Kubernetes clusters from Internet access. This may be a desirable feature
+    for enterprise users. Now they have the flexibility to choose between a
+    private cluster by default and only allow access to the API exposed on
+    Internet or make it fully accessible.
 releases:
   - version: 9.0.0.0rc1
     projects: