Feature/mongo 2.6.5 jshint tests

Fix JSHint issues with new pipeline test code that was (mostly) ported from the original 2.6.5 mongo code.
Part of an effort to cleanup various JSHint issues in one fell swoop so that we can keep things a bit cleaner going forward.

This wasn't being used by anything. I did some looking and it got added and was used but then got changed later to use a more specific `TestBase` within the test.
Most of these test classes were not particularly reusable between `_test.js` files. They were close, but not quite close enough.