Quoted IPv6 address support in address:port pairs [JIRA: RIAK-2462]

Looks like Cuttlefish [does not support quoted IPv6 addresses](https://github.com/basho/cuttlefish/blob/68d54f6b7f0e1e1528fc6ae8555c424d12a31d68/src/cuttlefish_datatypes.erl#L291) in address:port pairs because `inet:parse_address/1` does not. So `::1:5672` parses but `[::1]:5672` fails validation.

None of the tests I could find use IPv6 addresses, so please correct me if I'm wrong.
