fix cross-shard json generation of wiki pages
fix cross-shard json generation of wiki pages

fixes MBL-956

test plan:
 * access a wiki page from a shard it's not on (via the API)
 * it should work

Change-Id: Ia47966c359b1e33d38729ba0db9f108768ea3d57
Reviewed-on: https://gerrit.instructure.com/26323
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

SwinburneOnline/canvas-lms,arrivu/qibla-ecampus,shidao-fm/canvas-lms,leftplusrightllc/canvas-lms,venturehive/canvas-lms,usmschuck/canvas,djbender/canvas-lms,samuels410/greatlakes-lms,sfu/canvas-lms,kyroskoh/canvas-lms,snehakachroo1/LSI_replica,kyroskoh/canvas-lms,jay3126/canvas-lms,roxolan/canvas-lms,matematikk-mooc/canvas-lms,sdeleon28/canvas-lms,shidao-fm/canvas-lms,gbleydon/canvas-lms,dgynn/canvas-lms,va7map/canvas-lms,grahamb/canvas-lms,va7map/canvas-lms,roxolan/canvas-lms,wye0220/shindig-canvas,djbender/canvas-lms,arrivu/hoodemo,jay3126/canvas-lms,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,grahamb/canvas-lms,skmezanul/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,greyhwndz/canvas-lms,loganrun/pincan,arrivu/qibla-ecampus,dgynn/canvas-lms,djbender/canvas-lms,ShreniiNepal/shrenii_lmp,snehakachroo1/LSI_replica,antoniuslin/canvas-lms,wrdsb/canvas-lms,djbender/canvas-lms,Jyaasa/canvas-lms,ShreniiNepal/shrenii_lmp,narigone/canvas,utkarshx/canvas-lms,loganrun/pincan,grahamb/canvas-lms,eCNAP/CANVAS,sfu/canvas-lms,SwinburneOnline/canvas-lms,usmschuck/canvas,sdeleon28/canvas-lms,snehakachroo1/LSI_replica,shidao-fm/canvas-lms,instructure/canvas-lms,usmschuck/canvas,Unow/canvas-lms,AndranikMarkosyan/lms,AndranikMarkosyan/lms,va7map/canvas-lms,matematikk-mooc/canvas-lms,narigone/canvas,kyroskoh/canvas-lms,sfu/canvas-lms,wye0220/shindig-canvas,usmschuck/canvas,juoni/canvas-lms,ShreniiNepal/shrenii_lmp,gbleydon/canvas-lms,landonwilkins/canvas-lms,sdeleon28/canvas-lms,snehakachroo1/LSI_replica,utkarshx/canvas-lms,juoni/canvas-lms,HotChalk/canvas-lms,greyhwndz/canvas-lms,Jyaasa/canvas-lms,roxolan/canvas-lms,AndranikMarkosyan/lms,sfu/canvas-lms,landonwilkins/canvas-lms,redconfetti/canvas-lms,fronteerio/canvas-lms,arrivu/arrivu-lms,venturehive/canvas-lms,efrj/canvas-lms,shidao-fm/canvas-lms,loganrun/pincan,grahamb/canvas-lms,arrivu/hoodemo,instructure/canvas-lms,whalejasmine/canvas-lms,sdeleon28/canvas-lms,roxolan/canvas-lms,fronteerio/canvas-lms,efrj/canvas-lms,HotChalk/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,skmezanul/canvas-lms,redconfetti/canvas-lms,utkarshx/canvas-lms,dgynn/canvas-lms,tgroshon/canvas-lms,greyhwndz/canvas-lms,leftplusrightllc/canvas-lms,venturehive/canvas-lms,skmezanul/canvas-lms,sfu/canvas-lms,antoniuslin/canvas-lms,kyroskoh/canvas-lms,jay3126/canvas-lms,HotChalk/canvas-lms,matematikk-mooc/canvas-lms,Rvor/canvas-lms,instructure/canvas-lms,tgroshon/canvas-lms,jay3126/canvas-lms,greyhwndz/canvas-lms,Jyaasa/canvas-lms,landonwilkins/canvas-lms,whalejasmine/canvas-lms,wimemx/Canvas,narigone/canvas,landonwilkins/canvas-lms,Rvor/canvas-lms,sfu/canvas-lms,utkarshx/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,fronteerio/canvas-lms,efrj/canvas-lms,ShreniiNepal/shrenii_lmp,va7map/canvas-lms,arrivu/arrivu-lms,antoniuslin/canvas-lms,juoni/canvas-lms,Rvor/canvas-lms,arrivu/hoodemo,SwinburneOnline/canvas-lms,dgynn/canvas-lms,wrdsb/canvas-lms,samuels410/greatlakes-lms,efrj/canvas-lms,eCNAP/CANVAS,skmezanul/canvas-lms,whalejasmine/canvas-lms,Unow/canvas-lms,wye0220/shindig-canvas,wimemx/Canvas,arrivu/qibla-ecampus,instructure/canvas-lms,wrdsb/canvas-lms,tgroshon/canvas-lms,wrdsb/canvas-lms,narigone/canvas,samuels410/greatlakes-lms,leftplusrightllc/canvas-lms,arrivu/arrivu-lms,fronteerio/canvas-lms,gbleydon/canvas-lms,juoni/canvas-lms,eCNAP/CANVAS,Rvor/canvas-lms,Jyaasa/canvas-lms,leftplusrightllc/canvas-lms,tgroshon/canvas-lms,Unow/canvas-lms,wimemx/Canvas,venturehive/canvas-lms,HotChalk/canvas-lms,whalejasmine/canvas-lms,antoniuslin/canvas-lms,eCNAP/CANVAS,AndranikMarkosyan/lms,samuels410/greatlakes-lms