pkg/apis, staging: add HostUsers to pod spec
pkg/apis, staging: add HostUsers to pod spec

It is used to request that a pod runs in a unique user namespace.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
Co-authored-by: Rodrigo Campos <rodrigoca@microsoft.com>

Kubernetes-commit: 9e9b23fd3ca6c0c58ee401b18a65422c0564bec0

kubernetes/client-go