Fix db error after tests
Fix db error after tests

Setting REUSE_DB=1 will cause the custom test runner to
avoid attemptint to tear down the database when it's done
which appears to be when the "database has gone away" errors
are happening.

mozilla/kitsune,mozilla/kitsune,mozilla/kitsune,mozilla/kitsune,anushbmx/kitsune,anushbmx/kitsune,anushbmx/kitsune,anushbmx/kitsune