Fix kube 1.18

[EnriqueL8]

Fixes #311. Very difficult task to do with sed or awk, could be done in Golang but since yq used Golang it's simpler. Could add a yq binary to the repo so users don't have to download it.

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[functicons]

Thanks for the PR! But I feel this might not be the best solution to the problem. Can we first investigate whether it can be solved by upgrading controller-gen version? or using kustomize patch? Thanks!

[EnriqueL8]

@functicons should I raise another PR with kustomize?