Add cloud-provider flag to openstack cloud control manager

Recent OpenStack Cloud Control Manager (occm) fails without
cloud-provider flag, starting v1.21.0 onwards --cloud-provider cannot be
empty Error: --cloud-provider cannot be empty

Additionally, add create role for serviceaccounts/token resource [1].

[1] 7d844dac9d/manifests/controller-manager/cloud-controller-manager-roles.yaml (L52-L57)

Story: 2009023
Task: 42745
Change-Id: I55042665c25704cd65eb4e4883f8a796bdcdaa7f

magnum/drivers/common/templates/kubernetes/fragments/kube-apiserver-to-kubelet-role.sh

@@ -207,6 +207,12 @@ items:
     verbs:
     - create
     - get
+  - apiGroups:
+    - ""
+    resources:
+    - serviceaccounts/token
+    verbs:
+    - create
   - apiGroups:
     - ""
     resources:
@@ -360,6 +366,7 @@ spec:
         - /bin/openstack-cloud-controller-manager
         - --v=2
         - --cloud-config=/etc/kubernetes/cloud-config-occm
+        - --cloud-provider=openstack
         - --cluster-name=${CLUSTER_UUID}
         - --use-service-account-credentials=true
         - --bind-address=127.0.0.1