Description of problem:
When set swift application credentials, There are error "Failed to authenticate provider client: Post \"https://rhos-d.infra.prod.upshift.rdu2.redhat.com:13000/v3/auth/tokens\": EOF" in the registry operator log

Version-Release number of selected component (if applicable):

4.8.0-0.ci.test-2021-08-09-015622-ci-ln-km2d11t-latest

How reproducible:
always

Steps to Reproduce:
1.Create the application credential on openstack
 $openstack application credential list 
+----------------------------------+------+----------------------------------+-------------+------------+
| ID                               | Name | Project ID                       | Description | Expires At |
+----------------------------------+------+----------------------------------+-------------+------------+
| 7964d5af93ce477c9c35b1286998c516 | wxj  | 542c6ebd48bf40fa857fc245c7572e30 | None        | None       |
+----------------------------------+------+----------------------------------+-------------+------------+
2.Check the default value of image-registry-private-configuration after cluster installation

$oc get secret image-registry-private-configuration   -o yaml 
apiVersion: v1
data:
  REGISTRY_STORAGE_SWIFT_APPLICATIONCREDENTIALID: IiI=
  REGISTRY_STORAGE_SWIFT_APPLICATIONCREDENTIALNAME: IiI=
  REGISTRY_STORAGE_SWIFT_APPLICATIONCREDENTIALSECRET: IiI=
  REGISTRY_STORAGE_SWIFT_PASSWORD: ****
  REGISTRY_STORAGE_SWIFT_USERNAME: ****

3. Set application creds
$oc get  secret image-registry-private-configuration  -o yaml 
apiVersion: v1
data:
  REGISTRY_STORAGE_SWIFT_APPLICATIONCREDENTIALID: Nzk2NGQ1YWY5M2NlNDc3YzljMzViMTI4Njk5OGM1MTYK
  REGISTRY_STORAGE_SWIFT_APPLICATIONCREDENTIALNAME: d3hqCg==
  REGISTRY_STORAGE_SWIFT_APPLICATIONCREDENTIALSECRET: bE5JQTA4cUh1NGxm**********
  REGISTRY_STORAGE_SWIFT_PASSWORD: ****
  REGISTRY_STORAGE_SWIFT_USERNAME: ****

Actual results:
The registry are re-deployed successfully after secret setting.
But there are some errors in image registry operator logs

I0810 05:40:22.489228       1 controller.go:330] object changed: *v1.Config, Name=cluster (status=true): changed:status.conditions.0.lastTransitionTime={"2021-08-10T05:40:21Z" -> "2021-08-10T05:40:22Z"}, removed:status.conditions.0.message="Failed to authenticate provider client: Post \"https://rhos-d.infra.prod.upshift.rdu2.redhat.com:13000/v3/auth/tokens\": EOF", changed:status.conditions.0.reason={"Could not connect to registry storage" -> "Swift container Exists"}, changed:status.conditions.0.status={"Unknown" -> "True"}, changed:status.conditions.2.lastTransitionTime={"2021-08-10T05:40:21Z" -> "2021-08-10T05:40:22Z"}, changed:status.conditions.2.message={"Unable to apply resources: unable to sync storage configuration: Failed to authenticate provider client: Post \"https://rhos-d.infra.prod.upshift.rdu2.redhat.com:13000/v3/auth/tokens\": EOF" -> "The registry is ready"}, changed:status.conditions.2.reason={"Error" -> "Ready"}, changed:status.conditions.2.status={"True" -> "False"}


Expected results:
Should use application creds well

Additional info: