updates for riak 2.0 ubuntu/deb

Solves https://github.com/travis-ci/travis-ci/issues/2866.

I've tested this running ubuntu/precise64 via virtualbox/vagrant. The tests pass for the java 1.4.4 riak-java-client, https://github.com/basho/riak-java-client/tree/1.4.4, and the 2.0 spec tests from the riak-ruby-client, https://github.com/basho/riak-ruby-client.