klogr flatten logs some strings oddly

[benmoss]

/kind bug

What steps did you take and what happened:
Had a klogr log something with > in the string, and saw it come out as u003e

What did you expect to happen:
Just prints the > character

Anything else you would like to add:
https://play.golang.org/p/xoZ7_N1tkUw

[neolit123]

it's because of this:
https://github.com/kubernetes/klog/blob/master/klogr/klogr.go#L142

and it needs the following fix:
https://stackoverflow.com/questions/28595664/how-to-stop-json-marshal-from-escaping-and

/help
/priority backlog

[k8s-ci-robot]

@neolit123:
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In response to this:

it's because of this:
https://github.com/kubernetes/klog/blob/master/klogr/klogr.go#L142

and it needs the following fix:
https://stackoverflow.com/questions/28595664/how-to-stop-json-marshal-from-escaping-and

/help
/priority backlog

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