spec: fix special account config grandfathering, refs SD-1570
spec: fix special account config grandfathering, refs SD-1570

it's possible this broke in the rails 4.2 upgrade. only an issue in specs,
since db_load_data.rake explicitly creates the configs. it hasn't been an
issue in jenkins land, since we generally use schema snapshots, so the
accounts and their configs get created later on-demand. (even if a master
node didn't use a snapshot, its workers all would)

test plan:
1. create a fresh test db
2. run migrations
3. ensure the default and site admin accounts each get a
   canvas AccountAuthorizationConfig
4. ensure that you don't get a crapton of failing specs

Change-Id: Ia8c0eecd718f4fc9b3d0e19e9c2b48a89d33b0a0
Reviewed-on: https://gerrit.instructure.com/95222
Tested-by: Jenkins
Reviewed-by: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>
Product-Review: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>
QA-Review: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>

grahamb/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,venturehive/canvas-lms,matematikk-mooc/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,matematikk-mooc/canvas-lms,djbender/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms