Enhance inventory_cloud j2 template to support deployment on openstack vs local, hetzner

[cmoulliard]

Enhance inventory_cloud j2 template to support deployment on openstack vs local, hetzner.

A few modifications are required :

a) openshift_hostname
openshift_hostname=node_name -> openshift_hostname=ip

Should be good to see if we can also define a hostname for local, hetzner deployments.
If we use the Centos ISO created, then hostname command executed on the terminal of the vm returns : cloud and for hetzner -> CentOS-74-64-minimal
We should perhaps specify it as a name

b) Node, master, etcd

[masters]
10.8.250.104 openshift_public_hostname=10.8.250.104 openshift_hostname=172.16.195.12
Change To : -->
192.168.99.50 openshift_public_hostname=192.168.99.50 openshift_ip=192.168.99.50

[etcd]
10.8.250.104
Change To : -->
192.168.99.50 openshift_ip=192.168.99.50

[nodes]
10.8.250.104 openshift_node_labels="{'region':'infra','zone':'default', 'node-role.kubernetes.io/compute': 'true'}" \
   openshift_public_hostname=10.8.250.104 \
   openshift_hostname=172.16.195.12
   
Change To : -->

192.168.99.50 openshift_node_labels="{'region':'infra','zone':'default', 'node-role.kubernetes.io/compute': 'true'}" \
   openshift_public_hostname=192.168.99.50 \
   openshift_ip=192.168.99.50

See diff file

[geoand]

I will update the code introduced in #47 with this