Fix issue where 2 Redis VIPs are assigned, but only one used.

There is an extra RedisVipPort defined in network-isolation.j2.yaml
which is unused. This will waste an IP address, and can lead to
confusion if there are multiple ports named RedisVipPort.

This patch removes the extra (unneeded) instance of the VIP.

Change-Id: I222873859af1b4ed1050cfffe55687b2f8d4c528
Closes-bug: 1717017

environments/network-isolation.j2.yaml

@@ -22,9 +22,6 @@ resource_registry:
   {%- endfor %}
   OS::TripleO::Network::Ports::RedisVipPort: ../network/ports/vip.yaml
 
-
-  OS::TripleO::{{primary_role_name}}::Ports::RedisVipPort: ../network/ports/vip.yaml
-
   # Port assignments by role, edit role definition to assign networks to roles.
 {%- for role in roles %}
   # Port assignments for the {{role.name}}