Remove Drydock config options

Summary: Adding random config options has a higher cost now since we can't remove them without raising warnings in installs about missing/unknown config. These are a bit premature to expose just yet -- I might want to put them in web-based config, too.

Test Plan: Grepped for strings.

Reviewers: codeblock, btrahan

Reviewed By: codeblock

CC: aran

Maniphest Tasks: T2255

Differential Revision: https://secure.phabricator.com/D4467