spec: Reset DB counter in set_up, not tear_down
spec: Reset DB counter in set_up, not tear_down

This avoids a problem where, if the tear_down doesn't happen (say, if
the process is aborted), things wouldn't have been reset for the next
run. By doing it in the set_up, we can always count on IDs starting
at 1 every time the tests run.

Change-Id: I90ab810c03ea7f153dabc40b346d92bb2a11726f
Reviewed-on: https://gerrit.instructure.com/155194
Tested-by: Jenkins
Reviewed-by: Anju Reddy <851202533fb1f0b615e4547ba226c76996d060dd@instructure.com>
Product-Review: Tucker McKnight <4b51b98c1d84aa97854d216bd061ce5d3eda8a28@instructure.com>
QA-Review: Tucker McKnight <4b51b98c1d84aa97854d216bd061ce5d3eda8a28@instructure.com>

sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms