MCO has duplicate feature flags set for Kubelet causing errors on bringup.

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I0421 15:32:04.308472    2135 codec.go:98] "Using lenient decoding as strict decoding failed" err=<
Apr 21 15:32:04 ip-10-0-156-156 kubenswrapper[2135]:         strict decoding error: yaml: unmarshal errors:
Apr 21 15:32:04 ip-10-0-156-156 kubenswrapper[2135]:           line 29: key "RotateKubeletServerCertificate" already set in map
Apr 21 15:32:04 ip-10-0-156-156 kubenswrapper[2135]:  >
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