spec: recover from selenium driver badness in before(:all)
spec: recover from selenium driver badness in before(:all)

refs SD-701

sometimes the driver asplodes between example groups, which means the other
recovery code never runs, since we don't get past the before(:all)

Change-Id: I590f159f52b4384606f03fb11d72f93cbd4ddddf
Reviewed-on: https://gerrit.instructure.com/72275
Reviewed-by: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
Tested-by: Jenkins
Product-Review: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
QA-Review: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>

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