Introduce new kubelet volume manager

This commit adds a new volume manager in kubelet that synchronizes
volume mount/unmount (and attach/detach, if attach/detach controller
is not enabled).

This eliminates the race conditions between the pod creation loop
and the orphaned volumes loops. It also removes the unmount/detach
from the `syncPod()` path so volume clean up never blocks the
`syncPod` loop.

pkg/kubelet/runonce_test.go

@@ -38,9 +38,12 @@ import (
 	podtest "k8s.io/kubernetes/pkg/kubelet/pod/testing"
 	"k8s.io/kubernetes/pkg/kubelet/server/stats"
 	"k8s.io/kubernetes/pkg/kubelet/status"
+	kubeletvolume "k8s.io/kubernetes/pkg/kubelet/volume"
 	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util"
 	utiltesting "k8s.io/kubernetes/pkg/util/testing"
+	"k8s.io/kubernetes/pkg/volume"
+	volumetest "k8s.io/kubernetes/pkg/volume/testing"
 )
 
 func TestRunOnce(t *testing.T) {
@@ -73,7 +76,6 @@ func TestRunOnce(t *testing.T) {
 		containerRefManager: kubecontainer.NewRefManager(),
 		podManager:          podManager,
 		os:                  &containertest.FakeOS{},
-		volumeManager:       newVolumeManager(),
 		diskSpaceManager:    diskSpaceManager,
 		containerRuntime:    fakeRuntime,
 		reasonCache:         NewReasonCache(),
@@ -84,6 +86,19 @@ func TestRunOnce(t *testing.T) {
 	}
 	kb.containerManager = cm.NewStubContainerManager()
 
+	plug := &volumetest.FakeVolumePlugin{PluginName: "fake", Host: nil}
+	kb.volumePluginMgr, err =
+		NewInitializedVolumePluginMgr(kb, []volume.VolumePlugin{plug})
+	if err != nil {
+		t.Fatalf("failed to initialize VolumePluginMgr: %v", err)
+	}
+	kb.volumeManager, err = kubeletvolume.NewVolumeManager(
+		true,
+		kb.hostname,
+		kb.podManager,
+		kb.kubeClient,
+		kb.volumePluginMgr)
+
 	kb.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, kb.nonMasqueradeCIDR)
 	// TODO: Factor out "StatsProvider" from Kubelet so we don't have a cyclic dependency
 	volumeStatsAggPeriod := time.Second * 10