fix race condition in assignments selenium spec
fix race condition in assignments selenium spec

Change-Id: I46c75206a824d8f6d4f95f6ad95b9096cca39c22
Reviewed-on: https://gerrit.instructure.com/7268
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>

icelab/canvas,narigone/canvas,fronteerio/canvas-lms,arrivu/qibla-ecampus,efrj/canvas-lms,efrj/canvas-lms,venturehive/canvas-lms,Rvor/canvas-lms,utkarshx/canvas-lms,djbender/canvas-lms,narigone/canvas,whalejasmine/canvas-lms,Unow/canvas-lms,tgroshon/canvas-lms,va7map/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,leftplusrightllc/canvas-lms,kyroskoh/canvas-lms,venturehive/canvas-lms,merichar/canvas-lms,matematikk-mooc/canvas-lms,efrj/canvas-lms,antoniuslin/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,efrj/canvas-lms,whalejasmine/canvas-lms,utkarshx/canvas-lms,rup/Tarrax,juoni/canvas-lms,wye0220/shindig-canvas,Rvor/canvas-lms,Rvor/canvas-lms,fronteerio/canvas-lms,skmezanul/canvas-lms,merichar/canvas-lms,gbleydon/canvas-lms,va7map/canvas-lms,usmschuck/canvas,em2/canvas-lms,rup/Tarrax,arrivu/hiring-site,greyhwndz/canvas-lms,samuels410/greatlakes-lms,skmezanul/canvas-lms,parbros/red-innovadores-lms,sli7246/canvas_branch,shidao-fm/canvas-lms,skmezanul/canvas-lms,sdeleon28/canvas-lms,loganrun/pincan,va7map/canvas-lms,Rvor/canvas-lms,redconfetti/canvas-lms,shidao-fm/canvas-lms,arrivu/hoodemo,juoni/canvas-lms,wye0220/shindig-canvas,arrivu/arrivu-lms,ankithbti/canvas_lms,matematikk-mooc/canvas-lms,instructure/canvas-lms,redconfetti/canvas-lms,sli7246/canvas_branch,grahamb/canvas-lms,fronteerio/canvas-lms,parbros/red-innovadores-lms,djbender/canvas-lms,sli7246/canvas_branch,dgynn/canvas-lms,leftplusrightllc/canvas-lms,loganrun/pincan,ShreniiNepal/shrenii_lmp,SwinburneOnline/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,leftplusrightllc/canvas-lms,eCNAP/CANVAS,arrivu/jigsaw-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,redconfetti/canvas-lms,wimemx/Canvas,shidao-fm/canvas-lms,Unow/ins,sfu/canvas-lms,landonwilkins/canvas-lms,instructure/canvas-lms,dgynn/canvas-lms,AndranikMarkosyan/lms,SwinburneOnline/canvas-lms,loganrun/pincan,dgynn/canvas-lms,landonwilkins/canvas-lms,ShreniiNepal/shrenii_lmp,eCNAP/CANVAS,wrdsb/canvas-lms,tgroshon/canvas-lms,Unow/canvas-lms,tgroshon/canvas-lms,rup/Tarrax,greyhwndz/canvas-lms,sfu/canvas-lms,narigone/canvas,instructure/canvas-lms,wimemx/Canvas,SwinburneOnline/canvas-lms,snehakachroo1/LSI_replica,ottenhoff/canvas-lms,jay3126/canvas-lms,Jyaasa/canvas-lms,sdeleon28/canvas-lms,greyhwndz/canvas-lms,nditech/red-innovadores-lms,Unow/ins,roxolan/canvas-lms,sfu/canvas-lms,jay3126/canvas-lms,ShreniiNepal/shrenii_lmp,eCNAP/CANVAS,antoniuslin/canvas-lms,snehakachroo1/LSI_replica,jay3126/canvas-lms,eCNAP/CANVAS,va7map/canvas-lms,greyhwndz/canvas-lms,icelab/canvas,merichar/canvas-lms,Jyaasa/canvas-lms,kyroskoh/canvas-lms,grahamb/canvas-lms,arrivu/hoodemo,dgynn/canvas-lms,wimemx/Canvas,Unow/canvas-lms,Unow/ins,samuels410/greatlakes-lms,sfu/canvas-lms,antoniuslin/canvas-lms,ottenhoff/canvas-lms,antoniuslin/canvas-lms,sdeleon28/canvas-lms,usmschuck/canvas,kyroskoh/canvas-lms,nditech/red-innovadores-lms,utkarshx/canvas-lms,roxolan/canvas-lms,landonwilkins/canvas-lms,AndranikMarkosyan/lms,wrdsb/canvas-lms,grahamb/canvas-lms,tgroshon/canvas-lms,djbender/canvas-lms,wye0220/shindig-canvas,HotChalk/canvas-lms,roxolan/canvas-lms,roxolan/canvas-lms,instructure/canvas-lms,jay3126/canvas-lms,HotChalk/canvas-lms,grahamb/canvas-lms,kyroskoh/canvas-lms,utkarshx/canvas-lms,em2/canvas-lms,gbleydon/canvas-lms,arrivu/jigsaw-lms,samuels410/greatlakes-lms,whalejasmine/canvas-lms,parbros/red-innovadores-lms,whalejasmine/canvas-lms,sdeleon28/canvas-lms,shidao-fm/canvas-lms,arrivu/hiring-site,djbender/canvas-lms,nditech/red-innovadores-lms,arrivu/qibla-ecampus,snehakachroo1/LSI_replica,skmezanul/canvas-lms,snehakachroo1/LSI_replica,arrivu/hoodemo,arrivu/arrivu-lms,arrivu/arrivu-lms,venturehive/canvas-lms,juoni/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,ottenhoff/canvas-lms,HotChalk/canvas-lms,arrivu/hiring-site,landonwilkins/canvas-lms,venturehive/canvas-lms,ShreniiNepal/shrenii_lmp,AndranikMarkosyan/lms,nditech/red-innovadores-lms,em2/canvas-lms,juoni/canvas-lms,Jyaasa/canvas-lms,narigone/canvas,wrdsb/canvas-lms,fronteerio/canvas-lms,samuels410/greatlakes-lms,Jyaasa/canvas-lms,arrivu/jigsaw-lms,HotChalk/canvas-lms,arrivu/qibla-ecampus,AndranikMarkosyan/lms,usmschuck/canvas,sfu/canvas-lms,wrdsb/canvas-lms,icelab/canvas,instructure/canvas-lms,gbleydon/canvas-lms,ankithbti/canvas_lms,ankithbti/canvas_lms,usmschuck/canvas