The wrapper is called ApplyAdapter and is a struct, that has Apply(..)
method and some setters that allow to control kubectl apply behaviour
Addapter is expected to be used through Apply(..) function, which takes
slice of document.Document interface objects, writes them out to
temporary file system, from where they are picked up by kubectl Apply
module, and delivered to kubernetes cluster. The decision to use
temporary file system is based on the fact, that in current state
kubectl project currently only works with actual files, and ignores
io.Streams object, that is part of ApplyOptions struct, so it is
currently the only way to use it.
Change-Id: Idc5d79794149c00198f420d76cf9aa3b5264946e
d588c73e38