Rename job to be py2-setup-validate-errormsg

[samestep]

This should clarify its purpose, which is:

to make sure that we give an appropriate error message when someone tries to use python2

Test plan:

CI.

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 0e73eef (more details on the Dr. CI page):

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• 1/3 failures introduced in this PR
• 2/3 broken upstream at merge base e51f73a since Apr 21

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1 failure not recognized by patterns:

Job	Step	Action
pytorch_python_doc_build	Checkout code	🔁 rerun

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🚧 1 ongoing upstream failure:

These were probably caused by upstream breakages that are not fixed yet.

• pytorch_windows_vs2019_py36_cuda10.1_test1 since Apr 21 (7929bc7)
  • 🔁 rerun

🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is older than viable/strict, run these commands:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

• pytorch_xla_linux_bionic_py3_6_clang9_build on Apr 21 from 9:35am to 12:11pm (d43d659 - 90e532f)
  • 🔁 rerun

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[facebook-github-bot]

@samestep has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@samestep merged this pull request in 7660cb8.