Too wide permissions given to service accounts

[vinay50muddu]

The permissions associated with multiple service accounts needs to be revisited as not all verbs are required in some cases.

[SchSeba]

The sriov-network-operator use this webhook without the need to create all the secrets and stuff.
These are the minimal RBAC for that use case https://github.com/k8snetworkplumbingwg/sriov-network-operator/blob/master/bindata/manifests/webhook/002-rbac.yaml