(config-parsing-decomp-1) Eliminate unused seen_handles argument on…

Authored by schrockn on Dec 12 2019, 2:39 PM.


(config-parsing-decomp-1) Eliminate unused seen_handles argument on evaluate_config

Starting a workstream to decompose the config parsing pipeline to make
config mapping easier to manage and to have the config system be more readily
be reusable in other contexts (e.g. instance config, using the config system
to parameterize a solid factory, etc)

Going to pick off some easy clean up along the way

Test Plan: BK

Reviewers: alangenfeld, nate

Reviewed By: nate

Differential Revision: https://dagster.phacility.com/D1639