Added support for "stable" and "latest"aliases for --kubernetes-version

[ghost]

Added the check for the aliases.
In the issue's comment it was mentioned that the constant NewestKubernetesVersion should be 1.18.0-alpha.1 (now it is 1.17.0). I don't know if it was part of this issue so I left it unchanged.
Related to #6126

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[k8s-ci-robot]

Hi @ths-laurent. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ths-laurent
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You can assign the PR to them by writing /assign @afbjorklund in a comment when ready.

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[codecov-io]

Codecov Report

Merging #6142 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #6142      +/-   ##
==========================================
- Coverage   38.29%   38.27%   -0.02%     
==========================================
  Files         119      119              
  Lines        8077     8081       +4     
==========================================
  Hits         3093     3093              
- Misses       4581     4583       +2     
- Partials      403      405       +2

Impacted Files	Coverage Δ
cmd/minikube/cmd/start.go	22.6% <0%> (-0.14%)	⬇️

[sharifelgamal]

/ok-to-test

[minikube-bot]

Error: running mkcmp: exit status 1

[minikube-pr-bot]

All Times minikube: [ 112.716941 115.992934 113.660741]
All Times Minikube (PR 6142): [ 126.837507 122.764142 126.912963]

Average minikube: 114.123539
Average Minikube (PR 6142): 125.504871

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6142) |
+----------------------+-----------+--------------------+
| minikube v           |  0.294201 |           0.421536 |
| Creating kvm2        | 40.674218 |          47.676499 |
| Preparing Kubernetes | 47.396010 |          49.477623 |
| Pulling images       |  3.762576 |           2.899562 |
| Launching Kubernetes | 18.677894 |          20.296815 |
| Waiting for cluster  |  2.726629 |           2.888240 |
+----------------------+-----------+--------------------+

[tstromberg]

Do you mind removing the part of your PR that updates Newest to v1.18? I feel like the PR is doing too much. Otherwise, I think it's good to go.

[priyawadhwa]

Hey @ths-laurent, this PR is pretty close to merging! Are you still working on it? I'd love to get it merged, so if you are, please:

1. Rebase on master to resolve merge conflicts
2. Address any remaining review comments

and we can get this in!

[k8s-ci-robot]

@ths-laurent: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[tstromberg]

any hope for a rebase?

[tstromberg]

I'm going to close this for now since it's been stale for a while. Please reopen once the conflicts are resolved.