Revert the change from json-patch to merge-patch

[brendandburns]

Fixes #476 for now.

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[tg123]

so fixed by s/json-path/merge-path/g ?
this is due to autorest?

maybe by adding it to gen

[brendandburns]

@tg123 I'm thinking about adding it to the gen repo, but I'm trying to sort out a better answer w/ the autorest folks, this is a temporary patch until I figure out what we're doing.

(and yes perl -pi -e s/json-patch/merge-patch/g Kubernetes.cs is how I made this change)

[tg123]

/LGTM

btw, there was sed in https://github.com/kubernetes-client/gen/blob/master/openapi/csharp.sh#L62 already