Merge pull request #48996 from k82cn/remove_nc_old_code

Automatic merge from submit-queue (batch tested with PRs 53760, 48996, 51267, 54414). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Removed compatibality code for kubelet 1.2.

**What this PR does / why we need it**:
The next release is 1.8, it's time to remove the backward compatibility code for kubelet 1.2.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #48995 

**Release note**:
```release-note
The NodeController will not support kubelet 1.2.
```

pkg/controller/node/BUILD

@@ -60,7 +60,6 @@ go_library(
         "//pkg/util/node:go_default_library",
         "//pkg/util/system:go_default_library",
         "//pkg/util/taints:go_default_library",
-        "//pkg/util/version:go_default_library",
         "//plugin/pkg/scheduler/algorithm:go_default_library",
         "//vendor/github.com/golang/glog:go_default_library",
         "//vendor/github.com/prometheus/client_golang/prometheus:go_default_library",

pkg/controller/node/node_controller.go

@@ -55,7 +55,6 @@ import (
 	utilnode "k8s.io/kubernetes/pkg/util/node"
 	"k8s.io/kubernetes/pkg/util/system"
 	taintutils "k8s.io/kubernetes/pkg/util/taints"
-	utilversion "k8s.io/kubernetes/pkg/util/version"
 	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
 )
 
@@ -65,7 +64,6 @@ func init() {
 }
 
 var (
-	gracefulDeletionVersion = utilversion.MustParseSemantic("v1.1.0")
 	// UnreachableTaintTemplate is the taint for when a node becomes unreachable.
 	UnreachableTaintTemplate = &v1.Taint{
 		Key:    algorithm.TaintNodeUnreachable,

pkg/controller/node/util/BUILD

@@ -15,7 +15,6 @@ go_library(
         "//pkg/controller:go_default_library",
         "//pkg/kubelet/util/format:go_default_library",
         "//pkg/util/node:go_default_library",
-        "//pkg/util/version:go_default_library",
         "//vendor/github.com/golang/glog:go_default_library",
         "//vendor/k8s.io/api/core/v1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/errors:go_default_library",

pkg/controller/node/util/controller_utils.go

@@ -38,7 +38,6 @@ import (
 	"k8s.io/kubernetes/pkg/controller"
 	"k8s.io/kubernetes/pkg/kubelet/util/format"
 	nodepkg "k8s.io/kubernetes/pkg/util/node"
-	utilversion "k8s.io/kubernetes/pkg/util/version"
 
 	"github.com/golang/glog"
 )
@@ -47,10 +46,6 @@ var (
 	// ErrCloudInstance occurs when the cloud provider does not support
 	// the Instances API.
 	ErrCloudInstance = errors.New("cloud provider doesn't support instances")
-	// podStatusReconciliationVersion is the the minimum kubelet version
-	// for which the nodecontroller can safely flip pod.Status to
-	// NotReady.
-	podStatusReconciliationVersion = utilversion.MustParseSemantic("v1.2.0")
 )
 
 // DeletePods will delete all pods from master running on given node,