Update bonnie:db:reset rake task

#### Story ####
- https://www.pivotaltracker.com/story/show/67573064

#### Notes ####
- added <code>bonnie2-production-gold</code> database to <code>bonnie-dev.mitre.org</code> using resultant database from running <code>bonnie:db:reset</code>, and then deleting unnecessary users/bundles
- renamed original <code>bonnie:db:reset</code> to <code>bonnie:db:reset_legacy</code>
- added simple <code>bonnie:db:reset</code> task that just copies a database and prunes for DEMO measures