Update log pattern to match kubelet service name from kubelet .deb package

[ostrain]

This makes the log pattern match the kubelet service name from https://github.com/kubernetes/release/blob/master/cmd/krel/templates/latest/kubelet/kubelet.service which is what's installed by the kubelet .deb package (and presumably the rpm as well).

This also matches the example show in the docs here: https://kubernetes.io/docs/reference/node/systemd-watchdog/

Fixes #1129

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[mmiranda96]

/ok-to-test
/lgtm

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This pull-request has been approved by: mmiranda96, ostrain
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[ostrain]

/retest-required

[hakman]

/retest

[hakman]

Would something like this work better long term?

Suggested change

	"--pattern=Started (Kubernetes kubelet|kubelet.service|kubelet.service - Kubernetes kubelet|kubelet.service - kubelet: The Kubernetes Node Agent).",
	"--revert-pattern=Stopping (Kubernetes kubelet|kubelet.service|kubelet.service - Kubernetes kubelet|kubelet.service - kubelet: The Kubernetes Node Agent)..."
	"--pattern=Started (Kubernetes kubelet|kubelet.service|kubelet.service - .*).",
	"--revert-pattern=Stopping (Kubernetes kubelet|kubelet.service|kubelet.service - .*)..."