Enable archive of bridgestrap results

Once bridgestrap is declared stable enough for human consumption, the bridgestrap module should be enabled in CollecTor. Once data is available in CollecTor it will trickle down to Onionoo and thus relay search.

To enable the module:

ssh collector.torproject.org
sudo -u collector -s
cd /srv/collector.torproject.org/collector
vim collector.properties

Change BridgestrapStatsActivated = false to BridgestrapStatsActivated = true and restart collector.