use instance_exec for plugin t calls in 1.9
use instance_exec for plugin t calls in 1.9

this matches the expected behavior of all the plugin lambda blocks,
which is that no args will be passed in

Change-Id: I60cfc3dd411d6e7b0655c8ba7307f524c9601930
Reviewed-on: https://gerrit.instructure.com/5839
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>

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