don't load all members of all groups into memory
don't load all members of all groups into memory

just to find the first group a user is a member of

Change-Id: I94e5ad3389e849bc14f27977ac40355f674d3a1e
Reviewed-on: https://gerrit.instructure.com/28255
Reviewed-by: Anthus Williams <9b0bb6d8221e7e7c0d84e929f259a97887b2819e@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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