Attempt to fix flaky spec.
Attempt to fix flaky spec.

Spec is creating 5 students when 2 is probably enough for this
test.  Hopefully this speeds things up enough to result in
lower run times.

Fixes COMMS-955

Test Plan:
* Test still passes.

Change-Id: I1e4ef980a910275b865966add4c80af60ce392a0
Reviewed-on: https://gerrit.instructure.com/143032
Tested-by: Jenkins
Reviewed-by: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>
Product-Review: Venk Natarajan <f9eab59b292314637a3c917fea4742741e36a19b@instructure.com>
QA-Review: Venk Natarajan <f9eab59b292314637a3c917fea4742741e36a19b@instructure.com>

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