skip protocol v2 test on versions that don't support it

This ticket tracks the following failure:

http://cassci.datastax.com/view/Upgrades/job/storage_engine_upgrade_dtest-22_tarball-30_HEAD/lastCompletedBuild/testReport/upgrade_tests.cql_tests/TestCQL/test_v2_protocol_IN_with_tuples/

It's caused by a bug in the dtests, which is addressed in this PR:

https://github.com/riptano/cassandra-dtest/pull/587

Just adding this ticket for others' reference when they're looking at CassCI failures.