Use tokenreview v1 when authenticating against service accounts

[k-wall]

Use tokenreview v1 when authenticating against service accounts (for kube 1.22 compatibility)

https://kubernetes.io/docs/reference/using-api/deprecation-guide/#tokenreview-v122

Type of change

• Bugfix

Description

 2022-04-01T13:06:08.611Z WARN  [PlainSaslServerMechanism] Exception when authenticating @@serviceaccount@@: java.lang.RuntimeException: Error performing POST on /apis/authentication.k8s.io/v1beta1/tokenreviews: 404, {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"the server could not find the requested resource","reason":"NotFound","details":{},"code":404} at io.enmasse.keycloak.spi.K8sServiceAccountCredentialProvider.authenticateToken(K8sServiceAccountCredentialProvider.java:101) 

Checklist

• [ ] Update/write design documentation in ./documentation/design
• [ ] Write tests and make sure they pass
• [ ] Update documentation
• [ ] Check RBAC rights for Kubernetes / OpenShift roles
• [ ] Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• [ ] Reference relevant issue(s) and close them after merging
• [ ] Update CHANGELOG.md