vmware-vsphere-csi-driver-webhook handles HTTP/2 requests

Currently, vmware-vsphere-csi-driver-webhook exposes HTTP/2 endpoints:

$ oc -n openshift-cluster-csi-drivers exec deployment/vmware-vsphere-csi-driver-webhook -- curl -kv   https://localhost:8443/readyz

...
* ALPN, server accepted to use h2
> GET /readyz HTTP/2
< HTTP/2 404

To err on the side of caution, we should discontinue the handling of HTTP/2 requests.

4.15

Always

1. oc -n openshift-cluster-csi-drivers exec deployment/vmware-vsphere-csi-driver-webhook -- curl -kv https://localhost:8443/readyz 2.
3.

HTTP/2 requests are accepted

HTTP/2 requests shouldn't be accepted by wehook