Remove more stray reads from old-style options.

Also migrated jar_create to new-style options.

Also fixed up some test infrastructure.

Testing Done:
CI passed.

Reviewed at https://rbcommons.com/s/twitter/r/1286/
Sync of https://github.com/pantsbuild/pants/commit/2b83b885b13c55922dcfd740b40534ce559fe6f0