Generate documentation and tester changes from fdb.options automatically

[This change](https://github.com/apple/foundationdb/pull/2060/commits/95c6c9618ec65e9ab54b7462553109ef201bce95) was mechanical and tedious. It'd be nice if one only needed to changes fdb.options, and the documentation and test code were generated automatically.

Start by reviewing fdb.options and the referenced pull request commit to understand the current mechanical documentation and tester changes. Define an automatic generation path from fdb.options, with completion shown by producing equivalent documentation and test code changes without manual duplication.

Written by the indexing model from the issue text.