velodrome - upgrade py2 -> py3, #13164

[clarketm]

This is the successor to #13368 and #13380 regarding the python2 -> python3 ( #13164 ) migration and targets the velodrome directory. Note that the rationale for preferring ruamel.yaml over pyYAML is threefold:

1. Although bazel obviously does support dual-python at the binary compilation level, it does not support dual dependency installation bazelbuild/rules_python.
2. pyYAML determines python version at install time while ruamel.yaml does so at run time leveraging shimming and future imports.

The combination of the above, along with the fact that ruamel.yaml is a fork of pyYAML and a direct superset of it (according to the current usage) is the justification for the change.

[k8s-ci-robot]

Hi @clarketm. 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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[chases2]

/ok-to-test

[cjwagner]

Changes look fine, but please don't include merge commits in your PR branch. Instead rebase on the base branch to resolve conflicts.

[clarketm]

@cjwagner - my mistake; I was following the steps on the UI. In hindsight, I should have simply resolved via rebase on command-line. The commit history should now be clean 👍

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5cfeb625b8ff6377e0f7a50d4c726f2a3a0ec6c7

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjwagner, clarketm

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