test plan:
* create a user via SIS import with an e-mail address
* add a different e-mail address to the user
* re-import the user via SIS, and set their e-mail address
to the second e-mail you added, but with a different case
* the user should have a single e-mail address, the one set
in the second SIS import
Change-Id: Iab6b16e0b37cfb8caac3faa453be570b99621a9e
Reviewed-on: https://gerrit.instructure.com/7784
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
Reviewed-by: Zach Pendleton <zachp@instructure.com>
Cody Cutrer