Fix broken link in deployment prereq

[rafvasq]

Updates Openshift link in Kubernetes cluster deployment prerequisites.

Resolves #293

[ckadner]

Thanks @rafvasq for finding and fixing the broken link and curl command.

I just have a small nit-pick :-)

[ckadner]

Thanks Rafael. Sorry, I did not look at your second change carefully earlier.

[ckadner]

On second look, I don't think this change is right, even though curl seems to work with either command variation.

https://stackoverflow.com/questions/4181703/how-to-concatenate-string-variables-in-bash/4181721#4181721

This form _{$OS}_ prints the URL with braces "_{Darwin}_":

$ echo "https://github.com/kubernetes-sigs/kustomize/releases/download/v3.2.0/kustomize_3.2.0_{$OS}_amd64"

https://github.com/kubernetes-sigs/kustomize/releases/download/v3.2.0/kustomize_3.2.0_{Darwin}_amd64

The original format (_${OS}_) prints the URL correctly ( "_Darwin_" without braces):

$ echo "https://github.com/kubernetes-sigs/kustomize/releases/download/v3.2.0/kustomize_3.2.0_${OS}_amd64"

https://github.com/kubernetes-sigs/kustomize/releases/download/v3.2.0/kustomize_3.2.0_Darwin_amd64

[rafvasq]

Thanks for looking into it. I was having issues with the original curl command and now realize that it wasn't working for me because I'm using oh-my-zsh, which escapes characters with backslash when I paste a URL.

[ckadner]

/lgtm

Thanks Rafael

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[ckadner]

/assign @rafvasq