This adds the v1 lease controller

This refactors the v1 lease controller. It makes two functional differences
to the lease controller:
* It no longer ties lease updates to node pings or node status updates
* There is no fallback mechanism to status updates

This also moves vk_envtest, allowing for future brown-box testing of the
lease controller with envtest

node/main_test.go

@@ -0,0 +1,22 @@
+/* This file is just a place for the TestMain override function to live, plus whatever custom flags we are interested in */
+package node
+
+import (
+	"flag"
+	"os"
+	"testing"
+
+	klogv1 "k8s.io/klog"
+)
+
+var enableEnvTest = flag.Bool("envtest", false, "Enable envtest based tests")
+
+func TestMain(m *testing.M) {
+	flagset := flag.NewFlagSet("klog", flag.PanicOnError)
+	klogv1.InitFlags(flagset)
+	flagset.VisitAll(func(f *flag.Flag) {
+		flag.Var(f.Value, "klog."+f.Name, f.Usage)
+	})
+	flag.Parse()
+	os.Exit(m.Run())
+}