spec: add logic to quit chromedriver after tests have finished
spec: add logic to quit chromedriver after tests have finished

Test Plan:
- Tests should pass
- Code review by someone smarter than me ;)

Change-Id: I6236479a31ba7c90413b2066d0cb292ffbc4e31e
Reviewed-on: https://gerrit.instructure.com/74646
Tested-by: Jenkins
Reviewed-by: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>
Product-Review: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>
QA-Review: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>

venturehive/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,dgynn/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,roxolan/canvas-lms,sfu/canvas-lms,dgynn/canvas-lms,grahamb/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,dgynn/canvas-lms,matematikk-mooc/canvas-lms,roxolan/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,matematikk-mooc/canvas-lms,instructure/canvas-lms,SwinburneOnline/canvas-lms,dgynn/canvas-lms,matematikk-mooc/canvas-lms,roxolan/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,HotChalk/canvas-lms,matematikk-mooc/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms