revert to syck yaml engine in ruby 1.9, for delayed jobs
revert to syck yaml engine in ruby 1.9, for delayed jobs

Change-Id: I92310b0d30322192b7d2a5b20dad1c6a349af9f5
Reviewed-on: https://gerrit.instructure.com/5837
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>

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