rails3 specs for user lists controller

Change-Id: I598012d4e12c755e7d34398bdbf43836dece8563
Reviewed-on: https://gerrit.instructure.com/29770
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>
QA-Review: Derek DeVries <ddevries@instructure.com>