testnodes should move from 127.0.0.n to 127.0.1.n

Running the testnodes on 127.0.0.1 depends on maybe already dedicated ports. The testnodes could run under 127.0.1.n to avoid this. This change would allow testing/developing/package-building without stopping/altering a already running default cassandra installation.

This depends on changes defined in https://github.com/pcmanus/ccm/pull/49