Refactor uuid into its own pkg

pkg/kubelet/rkt/rkt.go

@@ -56,13 +56,13 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/util/format"
 	"k8s.io/kubernetes/pkg/securitycontext"
 	kubetypes "k8s.io/kubernetes/pkg/types"
-	"k8s.io/kubernetes/pkg/util"
 	"k8s.io/kubernetes/pkg/util/errors"
 	utilexec "k8s.io/kubernetes/pkg/util/exec"
 	"k8s.io/kubernetes/pkg/util/flowcontrol"
 	"k8s.io/kubernetes/pkg/util/selinux"
 	utilstrings "k8s.io/kubernetes/pkg/util/strings"
 	"k8s.io/kubernetes/pkg/util/term"
+	"k8s.io/kubernetes/pkg/util/uuid"
 	utilwait "k8s.io/kubernetes/pkg/util/wait"
 )
 
@@ -726,7 +726,7 @@ func (r *Runtime) makeContainerLogMount(opts *kubecontainer.RunContainerOptions,
 	// the container is launched, so here we generate a random uuid to enable
 	// us to map a container's termination message path to an unique log file
 	// on the disk.
-	randomUID := util.NewUUID()
+	randomUID := uuid.NewUUID()
 	containerLogPath := path.Join(opts.PodContainerDir, string(randomUID))
 	fs, err := r.os.Create(containerLogPath)
 	if err != nil {