This change adds a new *_from_pool.yaml meant to return an IP from
a list instead of allocating a Neutron port, useful to pick an IP
from a pre-defined list and making it possible to configure, for
example an external balancer in advance (or dns), with the future
IPs of the controller nodes.
The list of IPs is provided via parameter_defaults (in the
ControllerIPs struct) using ControllerIPs param.
Also some additional VipPort types are created for the *VirtualIP
resources. The VIPs were previously created using the same port
resource used by the nodes, but when deploying with an external
balancer we want the VIP resource to be nooped instead.
Change-Id: Id3d4f12235501ae77200430a2dc022f378dce336
22b4acf454