CLC-3632 Save torquebox log files

https://jira.ets.berkeley.edu/jira/browse/CLC-3632

Since we switched application servers to Torquebox, we've just been overwriting "calcentral/log/torquebox.log" on server restart. Given the importance of the Torquebox log for troubleshooting, we should instead append/rotate those log files like the others.