Description of problem:
Failed to expand PVC of cinder volume

Version-Release number of selected component (if applicable):
oc v3.9.0-0.16.0
openshift v3.9.0-0.16.0
kubernetes v1.9.0-beta1


How reproducible:
Always

Steps to Reproduce:
1. Enable feature-gates ExpandPersistentVolumes and admission-control PersistentVolumeClaimResize
2. Create a default storageclass, and set allowVolumeExpansion=true
3. Create a PVC using the default storageclass
4. Edit PVC, and change spec.resources.requests.storage from 5Gi to 6Gi
5. Check PVC and PV


Actual results:
PV expand from 5Gi to 6Gi
# oc get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS    CLAIM                                   STORAGECLASS   REASON    AGE
pvc-10de6a9c-f6a2-11e7-abbc-fa163e1b6c1d   6Gi        RWO            Delete           Bound     piqin/claim-1                           standard                 6m
pvc-8d319cdb-f673-11e7-aa75-fa163e1b6c1d   1Gi        RWO            Delete           Bound     openshift-ansible-service-broker/etcd   standard                 5h

PVC report VolumeResizeFailed event and exist in "Resizing" condition
# oc describe pvc
Name:          claim-1
Namespace:     piqin
StorageClass:  standard
Status:        Bound
Volume:        pvc-10de6a9c-f6a2-11e7-abbc-fa163e1b6c1d
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed=yes
               pv.kubernetes.io/bound-by-controller=yes
               volume.beta.kubernetes.io/storage-provisioner=kubernetes.io/cinder
Finalizers:    []
Capacity:      5Gi
Access Modes:  RWO
Events:
  Type     Reason                 Age   From                         Message
  ----     ------                 ----  ----                         -------
  Normal   ProvisioningSucceeded  1m    persistentvolume-controller  Successfully provisioned volume pvc-10de6a9c-f6a2-11e7-abbc-fa163e1b6c1d using kubernetes.io/cinder
  Warning  VolumeResizeFailed     18s   volume_expand                Invalid request due to incorrect syntax or missing required parameters.

# oc get pvc -o yaml
apiVersion: v1
items:
- apiVersion: v1
  kind: PersistentVolumeClaim
  metadata:
    annotations:
      pv.kubernetes.io/bind-completed: "yes"
      pv.kubernetes.io/bound-by-controller: "yes"
      volume.beta.kubernetes.io/storage-provisioner: kubernetes.io/cinder
    creationTimestamp: 2018-01-11T07:35:58Z
    name: claim-1
    namespace: piqin
    resourceVersion: "35013"
    selfLink: /api/v1/namespaces/piqin/persistentvolumeclaims/claim-1
    uid: 10de6a9c-f6a2-11e7-abbc-fa163e1b6c1d
  spec:
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 6Gi
    storageClassName: standard
    volumeName: pvc-10de6a9c-f6a2-11e7-abbc-fa163e1b6c1d
  status:
    accessModes:
    - ReadWriteOnce
    capacity:
      storage: 5Gi
    conditions:
    - lastProbeTime: null
      lastTransitionTime: 2018-01-11T07:42:39Z
      status: "True"
      type: Resizing
    phase: Bound
kind: List
metadata:
  resourceVersion: ""
  selfLink: ""


Expected results:
PVC expand successfully.

Additional info:
# oc get sc -o yaml
apiVersion: v1
items:
- allowVolumeExpansion: true
  apiVersion: storage.k8s.io/v1
  kind: StorageClass
  metadata:
    annotations:
      storageclass.beta.kubernetes.io/is-default-class: "true"
    creationTimestamp: 2018-01-11T02:00:17Z
    name: standard
    namespace: ""
    resourceVersion: "24919"
    selfLink: /apis/storage.k8s.io/v1/storageclasses/standard
    uid: 2bb0bd92-f673-11e7-aa75-fa163e1b6c1d
  parameters:
    fstype: xfs
  provisioner: kubernetes.io/cinder
  reclaimPolicy: Delete
kind: List
metadata:
  resourceVersion: ""
  selfLink: ""