feat(Dockerfile): openssh-client support

[maxime1907]

What type of PR is this?
/kind feature

What this PR does / why we need it:

openssh-client was present before this MR.
This simple commit adds it back as it let us manage ssh connections that require a private/public key instead of a password with sshpass.

Does this PR introduce a user-facing change?:

Add back openssh-client to docker image

[k8s-ci-robot]

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[oomichi]

openssh-client was present before this #9810.

I coud not find a git history which contained openssh-client on the Dockerfile.
I might miss something..

[maxime1907]

openssh-client was present before this #9810.

I coud not find a git history which contained openssh-client on the Dockerfile. I might miss something..

@oomichi its because we recently added a flag --no-install-recommends that skips some packages that were previously installed but not directly stated into the Dockerfile.

You can see it happened to others here too:

• Reducing the image size #9810 (comment)

[oomichi]

openssh-client was present before this #9810.

I coud not find a git history which contained openssh-client on the Dockerfile. I might miss something..

@oomichi its because we recently added a flag --no-install-recommends that skips some packages that were previously installed but not directly stated into the Dockerfile.

You can see it happened to others here too:

• Reducing the image size #9810 (comment)

Thank you for your explanation, I see that.

/ok-to-test
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maxime1907, oomichi

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[oomichi]

@maxime1907 Could you rebase this pull request to solve a conflict?

[maxime1907]

@oomichi done!

[yankay]

Thanks @maxime1907
/lgtm