Make rtssh set public Cuttlefish IPs for PB/HTTP

Something in Riak has changed such that the previous approach to
setting public IPs no longer appears to work for rtssh. Thus, rtssh
users such as rtcloud cannot provision clusters that can talk on
anything other than 127.0.0.1.

This commits add code that explicitly sets the PB/HTTP IPs when
Cuttlefish is being used, which seems to fix the issue.
Merge pull request #677 from basho/jdb-cuttlefish-ips

Make rtssh set public Cuttlefish IPs for PB/HTTP