Add environment to preselect only VIP IP addresses

Add environment to preselect only VIP IP addresses

This change adds two files which demonstrate manipulation of the
VIP IP addresses without using an external load balancer. This
allows the configuration of DNS, or allows for continuity when
replacing an existing environment.

The fixed IPs for the virtual IPs are set using the new parameters,
and this change also adds a RedisVirtualFixedIPs parameter for
setting the Redis VIP.

Partial-Bug: https://bugs.launchpad.net/tripleo/+bug/1604946
Change-Id: I4e926f1c6b30d4009d24a307bc21e07e1731b387