Cleanup a few things

Found a couple of minor bugs will reviewing some of the code (really, I was procrastinating some Python stuff). 

 * Make the import command fast again. I had added a flush() to make a test pass, but that slowed everything down. 1fdd3df fixes the test and removes the flush().
 * And while I was in the tests, I tried running them on a database that had fixtures - it worked nicely, except that the tests attempt to create users that the fixtures create. So test users are now uniquely named to avoid conflicts.

This PR passes travis - no schema or composer update required for this PR.