Description of problem (please be detailed as possible and provide log
snippets):

When cluster-wide encryption is enabled on an ODF cluster using the kube auth method and the auth config and backend path in Vault are defined inside a Vault namespace, the deployment fails with the following error in the rook-ceph-operator logs:

2022-02-01 05:41:19.883434 E | ceph-cluster-controller: failed to reconcile CephCluster "openshift-storage/ocs-storagecluster-cephcluster". failed to reconcile cluster "ocs-storagecluster-cephcluster": failed to configure local ceph cluster: failed to perform validation before cluster creation: failed to validate kms connection details: failed to get backend version: failed to initialize vault client: failed to get vault authentication token: Error making API request.

URL: PUT https://vault.qe.rh-ocs.com:8200/v1/auth/kubernetes/login
Code: 500. Errors:

* claim "iss" is invalid

2022-02-01 05:41:29.982275 I | clusterdisruption-controller: Ceph "openshift-storage" cluster not ready, cannot check Ceph status yet.

This error was seen even after disabling iss validation:

# vault write -namespace=odf auth/kubernetes/config token_reviewer_jwt="$(cat vault-sa-token)" kubernetes_host="${K8S_HOST}" kubernetes_ca_cert= disable_iss_validation=true


$ oc get cm ocs-kms-connection-details -n openshift-storage -o yaml
apiVersion: v1
data:
  KMS_PROVIDER: vault
  KMS_SERVICE_NAME: vault
  VAULT_ADDR: https://vault.qe.rh-ocs.com:8200
  VAULT_AUTH_KUBERNETES_ROLE: odf-rook-ceph-op
  VAULT_AUTH_METHOD: kubernetes
  VAULT_BACKEND_PATH: rook
  VAULT_CACERT: ocs-kms-ca-secret-afq7gj
  VAULT_CLIENT_CERT: ocs-kms-client-cert-e4plrg
  VAULT_CLIENT_KEY: ocs-kms-client-key-y5whe6
  VAULT_NAMESPACE: odf
  VAULT_TLS_SERVER_NAME: vault.qe.rh-ocs.com
kind: ConfigMap
metadata:
  creationTimestamp: "2022-02-01T05:34:44Z"
  name: ocs-kms-connection-details
  namespace: openshift-storage
  resourceVersion: "46732"
  uid: ef2e9d0d-4137-45ea-becf-bb9adfb1f480


Version of all relevant components (if applicable):
---------------------------------------------------
OCP: 4.10.0-0.nightly-2022-01-31-012936
ODF: odf-operator.v4.10.0        full_version=4.10.0-122



Does this issue impact your ability to continue to work with the product
(please explain in detail what is the user impact)?

Yes, deployment using Vault namespaces fails.


Is there any workaround available to the best of your knowledge?


Rate from 1 - 5 the complexity of the scenario you performed that caused this
bug (1 - very simple, 5 - very complex)?
2

Can this issue reproducible?
Yes

Can this issue reproduce from the UI?
Yes

If this is a regression, please provide more details to justify this:
No


Steps to Reproduce:
-------------------

1. Install the ODF operator

2. In the openshift-storage namespace, create a service account called odf-vault-auth
   # oc -n openshift-storage create serviceaccount odf-vault-auth

3. Create clusterrolebinding as shown below
   # oc -n openshift-storage create clusterrolebinding vault-tokenreview-binding --clusterrole=system:auth-delegator --serviceaccount=openshift-storage:odf-vault-auth

4. Get the secret name from the service account
   # oc -n openshift-storage get sa odf-vault-auth -o jsonpath="{.secrets[*]['name']}"

5. Get the Token and CA cert used to configure the kube auth in Vault
   # SA_JWT_TOKEN=$(oc -n openshift-storage get secret "$VAULT_SA_SECRET_NAME" -o jsonpath="{.data.token}" | base64 --decode; echo)
   # SA_CA_CRT=$(oc -n openshift-storage get secret "$VAULT_SA_SECRET_NAME" -o jsonpath="{.data['ca\.crt']}" | base64 --decode; echo)

6. Get the OCP endpoint and sa issuer
   # K8S_HOST=$(oc config view --minify --flatten -o jsonpath="{.clusters[0].cluster.server}")
   # issuer="$(oc get authentication.config cluster -o template="{{ .spec.serviceAccountIssuer }}")"

7. On the vault node/pod, configure the kube auth method
   # vault auth enable -namespace=odf kubernetes
   
   # vault write -namespace=odf auth/kubernetes/config \
          token_reviewer_jwt="$SA_JWT_TOKEN" \
          kubernetes_host="$K8S_HOST" \
          kubernetes_ca_cert="$SA_CA_CRT" \
          issuer="$issuer"

   # vault write -namespace=odf auth/kubernetes/role/odf-rook-ceph-op \
        bound_service_account_names=rook-ceph-system,rook-ceph-osd, noobaa \
        bound_service_account_namespaces=openshift-storage \
        policies=rook \
        ttl=1440h

   # vault write -namespace=odf auth/kubernetes/role/odf-rook-ceph-osd \
        bound_service_account_names=rook-ceph-osd \
        bound_service_account_namespaces=openshift-storage \
        policies=rook \
        ttl=1440h

8. From the ODF management console, follow the steps to create the storagesystem.
9. On the Security and network page, click on "Enable data encryption for block and file storage"
10. Select "Cluster-wide encryption" from encryption level and click on "Connect to an external key management service".
11. Set Authentication method to "Kubernetes" and fill out the rest of the details 
12. Review and create the storagesystem

Actual results:
---------------
The deployment fails with the following error:

2022-02-01 05:41:19.883434 E | ceph-cluster-controller: failed to reconcile CephCluster "openshift-storage/ocs-storagecluster-cephcluster". failed to reconcile cluster "ocs-storagecluster-cephcluster": failed to configure local ceph cluster: failed to perform validation before cluster creation: failed to validate kms connection details: failed to get backend version: failed to initialize vault client: failed to get vault authentication token: Error making API request.

URL: PUT https://vault.qe.rh-ocs.com:8200/v1/auth/kubernetes/login
Code: 500. Errors:

* claim "iss" is invalid


Expected results:
-----------------
The deployment should succeed