Co-authored-by: Weibin Lin <linweibin1@huawei.com>

kubeadm: fix nil pointer dereference

kubelet: remove unused parameter from runtime's SyncPod()

Fix typo in create-heapster-node

Limit scope and refactor config functions

fix typo: writeable->writable

fix priorityclass strategy comment

remove GCE cloud provider dependency to pkg/master/ports

Bump CoreDNS version to 1.3.1

Add ps1 to windows executable extensions

Added functionality for specifying target average value for object me…

Move informer event handlers to scheduler

If configuration file doesn't exist client variable is not assigned
and causes kubeadm crash:

$ sudo ./_output/bin/kubeadm reset
[reset] Reading configuration from the cluster...
[reset] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xf8 pc=0x108c9e7]

goroutine 1 [running]:
cmd/kubeadm/app/util/config.getInitConfigurationFromCluster(0x171109b, 0xf, 0x0, 0x0, 0xc0005b5a00, 0x3, 0x3, 0x69)
	cmd/kubeadm/app/util/config/cluster.go:93 +0x37
cmd/kubeadm/app/util/config.loadConfiguration(0x0, 0x0, 0x18d63a0, 0xc00000c018, 0x170620b, 0x5, 0x0, 0x0, 0x15d6000, 0x18d7601, ...)
	cmd/kubeadm/app/util/config/cluster.go:67 +0x374
k8s.io/kubernetes/cmd/kubeadm/app/util/config.FetchConfigFromFileOrCluster(0x0, 0x0, 0x18d63a0, 0xc00000c018, 0x170620b, 0x5, 0x0, 0x0, 0x497700, 0x18d63e0, ...)
	cmd/kubeadm/app/util/config/cluster.go:45 +0x9c
k8s.io/kubernetes/cmd/kubeadm/app/cmd.resetDetectCRISocket(0x0, 0x0, 0x1, 0x0, 0x18d63e0, 0xc0003f0630)
	cmd/kubeadm/app/cmd/reset.go:304 +0x73
k8s.io/kubernetes/cmd/kubeadm/app/cmd.NewCmdReset.func1(0xc0002a6780, 0x26dd548, 0x0, 0x0)
	cmd/kubeadm/app/cmd/reset.go:71 +0x267
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).execute(0xc0002a6780, 0x26dd548, 0x0, 0x0, 0xc0002a6780, 0x26dd548)
	vendor/github.com/spf13/cobra/command.go:760 +0x2cc
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0xc00019a000, 0xc000389180, 0xc00019a500, 0xc00057c1a0)
	vendor/github.com/spf13/cobra/command.go:846 +0x2fd
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).Execute(0xc00019a000, 0xc00000c010, 0x18d63a0)
	vendor/github.com/spf13/cobra/command.go:794 +0x2b
k8s.io/kubernetes/cmd/kubeadm/app.Run(0xc000086180, 0x18b)
	cmd/kubeadm/app/kubeadm.go:48 +0x202
main.main()
	cmd/kubeadm/kubeadm.go:29 +0x33

Removing check for configuration file existence should fix the issue.

make missing-directory errors non fatal

Update to latest gophercloud

Deleting pods assigned to not existing nodes only if

fix shellcheck in code-generator

remove `pkg/controller` dependencies from `k8s.io/kubernetes/pkg/cloudprovider/providers`

return original error, unless error is *meta.NoKindMatchError

remove kubelet flag '--experimental-fail-swap-on' (deprecated in v1.8)

remove dep to pkg/version in vSphere provider

Update cluster/gce/ scripts to support Windows nodes.

correct the type in status_manager.go

correct log output when specifed delete gracePeriod < minimumGracePer…

TestCreatePodSandbox_RuntimeClass should not expect RunPodSandbox when runtime class is not found

verify-generated-files-remake.sh: fix issues reported by shellcheck.

use k8s.io/client-go/pkg/version for cloud providers

ScheduleDaemonSetPods is enabled.

Migrate to k8s.io/utils/keymutex and k8s.io/utils/strings

Add exponential backoff for plugin registration