rebase: add controller runtime dependency

this commits add the controller runtime
and its dependency to the vendor.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/sigs.k8s.io/controller-runtime/pkg/controller/controller.go

@@ -0,0 +1,120 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"fmt"
+
+	"k8s.io/client-go/util/workqueue"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/internal/controller"
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+	"sigs.k8s.io/controller-runtime/pkg/ratelimiter"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+)
+
+// Options are the arguments for creating a new Controller
+type Options struct {
+	// MaxConcurrentReconciles is the maximum number of concurrent Reconciles which can be run. Defaults to 1.
+	MaxConcurrentReconciles int
+
+	// Reconciler reconciles an object
+	Reconciler reconcile.Reconciler
+
+	// RateLimiter is used to limit how frequently requests may be queued.
+	// Defaults to MaxOfRateLimiter which has both overall and per-item rate limiting.
+	// The overall is a token bucket and the per-item is exponential.
+	RateLimiter ratelimiter.RateLimiter
+}
+
+// Controller implements a Kubernetes API.  A Controller manages a work queue fed reconcile.Requests
+// from source.Sources.  Work is performed through the reconcile.Reconciler for each enqueued item.
+// Work typically is reads and writes Kubernetes objects to make the system state match the state specified
+// in the object Spec.
+type Controller interface {
+	// Reconciler is called to reconcile an object by Namespace/Name
+	reconcile.Reconciler
+
+	// Watch takes events provided by a Source and uses the EventHandler to
+	// enqueue reconcile.Requests in response to the events.
+	//
+	// Watch may be provided one or more Predicates to filter events before
+	// they are given to the EventHandler.  Events will be passed to the
+	// EventHandler if all provided Predicates evaluate to true.
+	Watch(src source.Source, eventhandler handler.EventHandler, predicates ...predicate.Predicate) error
+
+	// Start starts the controller.  Start blocks until stop is closed or a
+	// controller has an error starting.
+	Start(stop <-chan struct{}) error
+}
+
+// New returns a new Controller registered with the Manager.  The Manager will ensure that shared Caches have
+// been synced before the Controller is Started.
+func New(name string, mgr manager.Manager, options Options) (Controller, error) {
+	c, err := NewUnmanaged(name, mgr, options)
+	if err != nil {
+		return nil, err
+	}
+
+	// Add the controller as a Manager components
+	return c, mgr.Add(c)
+}
+
+// NewUnmanaged returns a new controller without adding it to the manager. The
+// caller is responsible for starting the returned controller.
+func NewUnmanaged(name string, mgr manager.Manager, options Options) (Controller, error) {
+	if options.Reconciler == nil {
+		return nil, fmt.Errorf("must specify Reconciler")
+	}
+
+	if len(name) == 0 {
+		return nil, fmt.Errorf("must specify Name for Controller")
+	}
+
+	if options.MaxConcurrentReconciles <= 0 {
+		options.MaxConcurrentReconciles = 1
+	}
+
+	if options.RateLimiter == nil {
+		options.RateLimiter = workqueue.DefaultControllerRateLimiter()
+	}
+
+	// Inject dependencies into Reconciler
+	if err := mgr.SetFields(options.Reconciler); err != nil {
+		return nil, err
+	}
+
+	// Create controller with dependencies set
+	c := &controller.Controller{
+		Do:       options.Reconciler,
+		Cache:    mgr.GetCache(),
+		Config:   mgr.GetConfig(),
+		Scheme:   mgr.GetScheme(),
+		Client:   mgr.GetClient(),
+		Recorder: mgr.GetEventRecorderFor(name),
+		MakeQueue: func() workqueue.RateLimitingInterface {
+			return workqueue.NewNamedRateLimitingQueue(options.RateLimiter, name)
+		},
+		MaxConcurrentReconciles: options.MaxConcurrentReconciles,
+		SetFields:               mgr.SetFields,
+		Name:                    name,
+	}
+
+	return c, nil
+}

vendor/sigs.k8s.io/controller-runtime/pkg/controller/doc.go

@@ -0,0 +1,25 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+Package controller provides types and functions for building Controllers.  Controllers implement Kubernetes APIs.
+
+Creation
+
+To create a new Controller, first create a manager.Manager and pass it to the controller.New function.
+The Controller MUST be started by calling Manager.Start.
+*/
+package controller