Add 'stable' and 'latest' as valid kubernetes-version values

[linkvt]

Fixes #6126

Hi,

mini PR, this was done with quite a lot of other changes in #6142 already but the user deleted his account.

I added the tags to the CLI help output, used a case insensitive comparison and really basic tests which are longer then the actual code but I think they still make sense e.g. to catch errors during refactorings or such.

CLI Output:

 $ out/minikube start --help | grep kubernetes-version
      --kubernetes-version='': The kubernetes version that the minikube VM will use (ex: v1.2.3 or latest/stable for supported versions)

Edit: I could adjust the CLI help output to contain the mapping from latest/stable to the appropriate version, it could look like:

 $ out/minikube start --help | grep kubernetes-version
      --kubernetes-version='': The kubernetes version that the minikube VM will use (ex: v1.2.3, 'stable' for v1.18.0-rc.1, 'latest' for v1.18.0-rc.1)

BR, Vincent

[k8s-ci-robot]

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[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[tstromberg]

/ok-to-test

[tstromberg]

I like your latter idea for the help output. It can be provided in a follow-up PR too.

[minikube-pr-bot]

Error: running mkcmp: exit status 1

[linkvt]

@tstromberg I added the CLI help changes here and flattened the ifs for parsing the version a bit.

[medyagh]

Thank you for this PR. This is is a useful feature