Enable OpenSSH on Windows nodes in test clusters.

Fix shellcheck lint errors in cluster/addons/fluentd-elasticsearch/fl……uentd-es-image/run.sh

fix the disruption-recheck metrics register error

fix shellcheck in k8s.io/metrics

kubeadm: Support >= 5.0 Linux kernel

clarify PreStop hook intended behavior in doc

Lowers the default nodelocaldns denial cache TTL

Add health plugin for CoreDNS in the DNS tests

Fix typo, and note BoundObjectRef isn't always checked

https://github.com/coredns/coredns/blob/master/plugin/cache/cache.go#L236
This gets rounded down to the nearest multiple of 256: 9984

Also switches to the most recent 64-bit version of OpenSSH for Windows.

Tested:
PROJECT=${CLOUDSDK_CORE_PROJECT} KUBERNETES_SKIP_CONFIRM=y NUM_NODES=2 \
NUM_WINDOWS_NODES=2 KUBE_GCE_ENABLE_IP_ALIASES=true TEST_CLUSTER=true \
./cluster/kube-up.sh

Default to Windows Server version 1809 for Windows nodes.

Turn off command echoing in test to avoid illegal bytes in XML

Narrow k8s.io/api auto-labeling

make test/cmd/delete.sh pass shellcheck

kubeadm cleanup: master -> control-plane (cont.2)

tests: Adds [LinuxOnly] tag to conformance test

Removes all references to 1803, including moving "win1803" directory to
just "windows". A single Windows directory suffices for now, if
necessary in the future we can shard it into directories for each
Windows version.

We've been running tests with Windows 1809 nodes for a couple days in
our fork without major problems:
https://testgrid.k8s.io/google-windows#windows-prototype&width=20.
Testing on Azure is already using 1809:
https://testgrid.k8s.io/sig-windows#Conformance%20acs-engine%20on%20Azure&width=20.

Use same fsGroup for both pods

correct error string according to golang best practice

Signed-off-by: Martynas Pumputis <m@lambda.lt>

Delete unuse const and fix some typos

kubeadm: drop applyFlags.newK8sVersionStr field

Issue 71769: Correctly display '_' in the help message

Fix some shellcheck failures in hack

Ingress extensions/v1beta1 -> networking.k8s.io/v1beta1

Fixed a minor bug

Fix hash if statement

Fix golint failures on e2e/[..]/(aws|azure)

volumes are unmounted or not

Do not return error on invalid MAC address in vSphere Cloud Provider

Fix shellcheck lint errors in ./hack/...

update pull request

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Deprecate containerized kubelet