Upgrade test on 2.1->3.0 path fails with configuration problems

The following test fails on the uprgrade path from 2.1 to 3.0:

http://cassci.datastax.com/view/Upgrades/job/cassandra_upgrade_2.1_to_3.0_proto_v3/10/testReport/upgrade_through_versions_test/TestUpgrade_from_3_0_latest_tag_to_3_0_HEAD/bootstrap_multidc_test/

I believe it's basically a configuration error; the cluster likely just needs to be reconfigured in the test:

code=2200 [Invalid query] message="User-defined functions are disabled in cassandra.yaml - set enable_user_defined_functions=true to enable"

Assigning to rhatch for now.