Overcloud controller host domain is forced to HOST.localdomain in /etc/hosts

Issue

When change the default domain of the overcloud, the installation fails because the entries in /etc/hosts for the controllers will still have .localdomain as domain and host lookup fails.

Reproduce:
1. change under cloud neutron/nova to use non default domain (e.g. example.com)
2. set CloudDomain: example.com in overcloud parameter file
3. deploy overcloud

As a result the controller will still have .localdomain

Mar  3 04:23:45 localhost os-collect-config: 172.17.0.14 compute1.example.com compute1
Mar  3 04:23:45 localhost os-collect-config: 172.17.0.15 controller0.localdomain controller0
Mar  3 04:23:45 localhost os-collect-config: 172.17.0.17 controller1.localdomain controller1
Mar  3 04:23:45 localhost os-collect-config: 172.17.0.18 controller2.localdomain controller2