Rename ConfigOK to KubeletConfigOk

[mtaufen]

This is a more accurate name for the condition, as it describes the
status of the Kubelet's configuration.

Also cleans up capitalization of internal names.

The ConfigOK node condition has been renamed to KubeletConfigOk.

[dashpole]

Good stuff. While it wasn't necessarily ambiguous whose config it was referring to, I think this change makes it even more obvious.
Is this considered an API change? I guess Dynamic Kubelet config is still Alpha, so it wouldn't matter anyways.
/lgtm

[mtaufen]

Yeah, should be ok since it's alpha.

[dchen1107]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dashpole, dchen1107, mtaufen

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