Possibly sort results in a getopts test

[catamorphism]

A comment in test_groups_getopts in std::getopts said to sort the two option sets. I gave up upon realizing they're not just vectors of something easily sortable.

[msullivan]

Cleanup, but not really important. Not milestoning.

[bblum]

Still cleanup, still not really important. Still not milestoning.