This fix contains few things:
* Used k8s.gcr.io/debian-base-amd64:v2.0.0 as base image to build storage-provisioner
* Modify RBAC permission used to cluster-admin
* Build storage-provisioner as static binary
Previously we were mixed between the two forms. This commit picks %v,
which is consistent with the Kubernetes code base. They both effectively
do the same thing in this case, though %v works with any object, and %s
only with string objects.