chore(Dockerfile): python requirements file

[maxime1907]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Ansible update to 2.15 in requires_ansible has broken the usage of kubespray in Dockerfile

Output:

fatal: [localhost]: FAILED! => {
    "assertion": "ansible_version.string is version(minimal_ansible_version, \">=\")",
    "changed": false,
    "evaluated_to": false,
    "msg": "Ansible must be between 2.15.5 and 2.17.0 exclusive - you have 2.14.6"
}

Introduced in this PR:

• Update to ansible 2.15 #10481

Does this PR introduce a user-facing change?:

chore(Dockerfile): python requirements file fixup

[k8s-ci-robot]

Hi @maxime1907. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[yankay]

/ok-to-test

[VannTen]

As far as I can tell, the only thing required to fix the error is mounting the requirements.txt file and using that instead of the package list.
Could you revert or split out the other changes (especially whitespaces only...) ? If there is a need for cleanup of the Dockerfile that should be in another PR.

[maxime1907]

As far as I can tell, the only thing required to fix the error is mounting the requirements.txt file and using that instead of the package list. Could you revert or split out the other changes (especially whitespaces only...) ? If there is a need for cleanup of the Dockerfile that should be in another PR.

done!

[maxime1907]

Done with the review changes!
I have opened another PR for global cleanup here^^:

• chore(Dockerfile): best practices #10708

[VannTen]

Thanks !
/lgtm
/assign @mzaian
(for approval)

[mzaian]

Thanks @maxime1907

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[maxime1907]

Done with the rebase!

[VannTen]

/lgtm