Moving the cloudprovider interface to staging.

Individual implementations are not yet being moved.
Fixed all dependencies which call the interface.
Fixed golint exceptions to reflect the move.
Added project info as per @dims and
https://github.com/kubernetes/kubernetes-template-project.
Added dims to the security contacts.
Fixed minor issues.
Added missing template files.
Copied ControllerClientBuilder interface to cp.
This allows us to break the only dependency on K8s/K8s.
Added TODO to ControllerClientBuilder.
Fixed GoDeps.
Factored in feedback from JustinSB.

pkg/controller/client_builder.go

@@ -42,6 +42,8 @@ import (
 )
 
 // ControllerClientBuilder allows you to get clients and configs for controllers
+// Please note a copy also exists in staging/src/k8s.io/cloud-provider/cloud.go
+// TODO: Extract this into a separate controller utilities repo (issues/68947)
 type ControllerClientBuilder interface {
 	Config(name string) (*restclient.Config, error)
 	ConfigOrDie(name string) *restclient.Config