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/log/log.go

@@ -0,0 +1,48 @@
+/*
+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 log contains utilities for fetching a new logger
+// when one is not already available.
+//
+// The Log Handle
+//
+// This package contains a root logr.Logger Log.  It may be used to
+// get a handle to whatever the root logging implementation is.  By
+// default, no implementation exists, and the handle returns "promises"
+// to loggers.  When the implementation is set using SetLogger, these
+// "promises" will be converted over to real loggers.
+//
+// Logr
+//
+// All logging in controller-runtime is structured, using a set of interfaces
+// defined by a package called logr
+// (https://godoc.org/github.com/go-logr/logr).  The sub-package zap provides
+// helpers for setting up logr backed by Zap (go.uber.org/zap).
+package log
+
+import (
+	"github.com/go-logr/logr"
+)
+
+// SetLogger sets a concrete logging implementation for all deferred Loggers.
+func SetLogger(l logr.Logger) {
+	Log.Fulfill(l)
+}
+
+// Log is the base logger used by kubebuilder.  It delegates
+// to another logr.Logger.  You *must* call SetLogger to
+// get any actual logging.
+var Log = NewDelegatingLogger(NullLogger{})