Refactor CLB to work with groups

The Rackspace CLB resource couldn't be used with resource groups
because nodes were individual IPs or references. This change
allows a node to have a list of ips for a given port, status,
etc so that references to resource groups can easily be added
to Rackspace CLB instances. Ref-based nodes were removed as they
aren't used.

Change-Id: Ia26a012758fb1cd0470c1c0edc27e61e77bd8f0a
Merge "Refactor CLB to work with groups"