IPv6 Support

[calebgroom]

API has been updated. Handle IPv6 nicely.

[calebgroom]

Creating a public LB provides both an IPv4 and IPv6 IP without modification:

 $ clb create newlb 80 HTTP '10.1.1.1:80,10.2.2.2:80' public
 $ clb show newlb | grep VIP
 | VIP 1246            | 50.56.5.50 (PUBLIC)                              |
 | VIP 9000031         | 2001:4801:7901:0000:72b2:85ea:0000:0001 (PUBLIC) |

• Need to add a 'type' attribute so that users can specify IPv4 only or IPv6 only when using the create command.
• Need to add an 'add-ip' command to add IPv6 VIPs
• Need to add a 'delete-ip' command to delete IPv4 or IPv6 VIPs