add example around inventory variables

Jinja-Template-Iterate-over-Inventory/haproxy.cfg

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+# BLA BLA BLA

Jinja-Template-Iterate-over-Inventory/hosts

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+[masters]
+ose3-master[1:3].test.example.com
+
+[etcd]
+ose3-master[1:3].test.example.com
+
+[nodes]
+ose3-master[1:3].test.example.com
+ose3-infra[1:2].test.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
+ose3-node[1:2].test.example.com openshift_node_labels="{'region': 'primary', 'zone': 'default'}"
+
+[nfs]
+ose3-master1.test.example.com
+
+[lb]
+ose3-lb.test.example.com
+
+# Create an OSEv3 group that contains the masters and nodes groups
+[OSEv3:children]
+masters
+nodes
+etcd
+lb
+nfs
+
+[OSEv3:vars]
+# BLA BLA BLA

Jinja-Template-Iterate-over-Inventory/playbook.yml

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+- hosts: localhost
+  tasks:
+  - name: Add conf haproxy for infra node
+    blockinfile:
+      path: '{{ playbook_dir }}/haproxy.cfg'
+      marker: "# {mark} Add haproxy conf"
+      insertafter: "EOF"
+      content: |
+        frontend atomic-openshift-web
+            bind *:80
+            bind *:443
+            default_backend atomic-openshift-web
+            mode tcp
+            option tcplog
+        
+        backend atomic-openshift-web
+            balance source
+            mode tcp
+        {% for item in groups['nodes'] -%}
+        {%- set node_labels = hostvars[item]['openshift_node_labels']|default({}) -%}
+        {%- if 'region' in node_labels and node_labels['region'] == "infra" %}
+            server {{ hostvars[item]['inventory_hostname_short'] }} {{ hostvars[item]['inventory_hostname'] }}
+        {% endif -%}
+        {%- endfor -%}