godeps: update vmware/govmomi to v0.20 release

vendor/github.com/vmware/govmomi/simulator/task_manager.go

@@ -20,6 +20,8 @@ import (
 	"sync"
 
 	"github.com/vmware/govmomi/object"
+	"github.com/vmware/govmomi/simulator/esx"
+	"github.com/vmware/govmomi/simulator/vpx"
 	"github.com/vmware/govmomi/vim25/mo"
 	"github.com/vmware/govmomi/vim25/types"
 )
@@ -34,6 +36,11 @@ type TaskManager struct {
 func NewTaskManager(ref types.ManagedObjectReference) object.Reference {
 	s := &TaskManager{}
 	s.Self = ref
+	if Map.IsESX() {
+		s.Description = esx.Description
+	} else {
+		s.Description = vpx.Description
+	}
 	Map.AddHandler(s)
 	return s
 }