Mark NodeNotReady for docker version below 1.6.2

pkg/kubelet/rkt/rkt.go

@@ -51,6 +51,8 @@ import (
 )
 
 const (
+	RktType = "rkt"
+
 	acVersion             = "0.7.1"
 	minimumRktVersion     = "0.9.0"
 	recommendRktVersion   = "0.9.0"
@@ -864,6 +866,10 @@ func (r *Runtime) GetPodStatus(pod *api.Pod) (*api.PodStatus, error) {
 	return r.getPodStatus(serviceName)
 }
 
+func (r *Runtime) Type() string {
+	return RktType
+}
+
 // Version invokes 'rkt version' to get the version information of the rkt
 // runtime on the machine.
 // The return values are an int array containers the version number.