added copy.sh which cuts the client repo; made necessary changes to scripts in

the repo to cope with the client repo staging area; added symlink
vendor/k8s.io/client-go which pointed to the staging area.

hack/make-rules/helpers/cache_go_dirs.sh

@@ -38,6 +38,7 @@ function kfind() {
         -not \(                    \
             \(                     \
                 -path ./vendor -o  \
+                -path ./staging -o \
                 -path ./_\* -o     \
                 -path ./.\* -o     \
                 -path ./docs -o    \