[releng] Issue #8401: Retire module streams "avocado:stable" and "avocado:52lts" from Fedora 31

merlinm reported a new issue against the project: `releng` that you are following: `` * Name of the module? `avocado`

* Stream name(s) and the new EOL date? `stable` - EOL of Fedora 30 `52lts` - EOL of Fedora 30

* Any extra information? Please drop these module streams from the Fedora 31 repos. They are Python 2-only, and will no longer build, install, or run on Fedora 31. The modulemd definitions for the streams have already been updated to stop builds beyond Fedora 30. ``

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