test plan:
* conclude an enrollment through sis csv import
* it should have a completed date on the user's course
profile page
closes #SIS-1655
Change-Id: Iba3f4d579e293df6f68964027e7b5a1f5b51d90f
Reviewed-on: https://gerrit.instructure.com/69740
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Product-Review: James Williams <jamesw@instructure.com>