[rbdemo] Delete the SCMTools prior to loading in fixtures.
Review Request #7138 — Created March 30, 2015 and submitted
It was easy to get into a situation where SCMTools from the fixtures conflicted with what was populated from registerscmtools. We now clear out the SCMTools in the database immediately before we load the fixture data.
This fixed a problem I had on demo.reviewboard.org with deploying updates
to the fixtures.