ConvertDownwardAPIFieldLabel converts the specified downward API field label and its value in the pod of the specified version to the internal version, and returns the converted label and value.

VisitContainersWithPath invokes the visitor function with a pointer to the spec of every container in the given pod spec and the field.Path to that container.

ContainerVisitorWithPath is called with each container and the field.Path to that container, and returns true if visiting should continue.