python2-ordered-set: Add at 3.1.1

[sheepman4267]

Summary
This is an old version of the PyPI ordered-set which works with python2. It is required to enable a deterministic install order for some packages in eopkg py2.

Test Plan

1. Build package from this PR.
2. Install it.
3. Run a python REPL.
4. Type import ordered_set and see that the module is available, even in python2.

Checklist

• Package was built and tested against unstable

[ermo]

I'm curious why this is only a draft since, at a glance, it looks ready to go in?

[sheepman4267]

I'm curious why this is only a draft since, at a glance, it looks ready to go in?

It's a draft for 2 reasons:

1. The functionality it's needed for is currently still under heavy testing, and we otherwise have a policy to avoid adding additional py2 packages.
2. I wanted some feedback (and forgot to say so in the PR) on the package name. Traditionally, we've been using python-package for py2 stuff, and python3-package for py3. However, python-ordered-set is already the py3 version, and I don't want to deal with the rename dance over there. I also really didn't want to ship two different versions in that package, so went with the name I did. I think this makes sense, but wanted to confirm it as it's a departure from our standard practice.

[ermo]

I'm curious why this is only a draft since, at a glance, it looks ready to go in?

It's a draft for 2 reasons:

1. The functionality it's needed for is currently still under heavy testing, and we otherwise have a policy to avoid adding additional py2 packages.

The functionality is necessary for the solus-sc-based py2 pisi code for the epoch prep stuff and after the epoch until solus-sc, pisi and python2 is deprecated and removed from the repo.

It goes in.

2. I wanted some feedback (and forgot to say so in the PR) on the package name. Traditionally, we've been using python-package for py2 stuff, and python3-package for py3. However, python-ordered-set is already the py3 version, and I don't want to deal with the rename dance over there. I also really didn't want to ship two different versions in that package, so went with the name I did. I think this makes sense, but wanted to confirm it as it's a departure from our standard practice.

python2-ordered-set is explicit. I like explicit. And this will go away soon-ish anyway, as it'll be deprecated at some point after the epoch bump.