DevStack: Allow kuryr-cni SA to create Events

Permissions to create Events was added to the kuryr-controller
ServiceAccount, but not to the kuryr-cni one. This commit fixes this,
allowing kuryr-daemon to create Events in DevStack.

Change-Id: I59a9de2f6cd3314b1326c43c4c1eefa8e445b9ee

devstack/lib/kuryr_kubernetes

@@ -478,6 +478,11 @@ rules:
   verbs: ["*"]
   resources:
     - kuryrports
+- apiGroups: ["", "events.k8s.io"]
+  resources:
+  - events
+  verbs:
+  - create
 ---
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1