Switch to 2-node configuration for IR plugin testing

Change-Id: Ifeed49ee6a5f57fc2ebf69adbae16894ad3c69a2

roles/tobiko-inventory/defaults/main.yaml

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+---
+
+test_inventory_user: '{{ ansible_user }}'
+test_inventory_hostvars: {}
+test_inventory_file: '{{ test_src_dir | realpath }}/ansible_hosts'

roles/tobiko-inventory/meta/main.yaml

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+---
+
+dependencies:
+  - role: tobiko-common

roles/tobiko-inventory/tasks/main.yaml

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+---
+
+- name: "read platform vars from file"
+  include_vars: "{{ item }}"
+  with_first_found:
+    - "test-inventory-{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yaml"
+    - "test-inventory-{{ ansible_distribution }}.{{ ansible_architecture }}.yaml"
+    - "test-inventory-{{ ansible_distribution }}.yaml"
+    - "test-inventory-{{ ansible_os_family }}.yaml"
+  register: include_platform_vars
+
+
+- debug: var=test_inventory_python_interpreter
+
+
+- when: test_inventory_user is not defined
+  block:
+    - name: "get remote username"
+      command: whoami
+      changed_when: false
+      become: false
+      register: get_inventory_user
+
+    - name: "set test_inventory_user fact"
+      set_fact:
+        test_inventory_user: "{{ get_inventory_user.stdout_lines | first }}"
+
+
+- debug: var=test_inventory_user
+
+
+- name: "get default test_inventory_hostvars entries from hostvars"
+  set_fact:
+    test_inventory_hostvars: >
+      {{ {hostname: {varname: value} } |
+         combine(test_inventory_hostvars) }}
+  vars:
+    hostname: '{{ item.0 }}'
+    varname: '{{ item.1 }}'
+    value: '{{ hostvars[hostname][varname] }}'
+  loop: "{{ hostvars.keys() | product(['ansible_host']) | list }}"
+  loop_control:
+    label: '{{ hostname }}.{{ varname }} = {{ value }}'
+  when:
+    - hostvars[hostname][varname] is defined
+    - test_inventory_hostvars[hostname][varname] is not defined
+
+
+- debug: var=test_inventory_hostvars
+
+
+- name: "writes inventory file to: '{{ test_inventory_file }}'"
+  template:
+    src: 'test_inventory.j2'
+    dest: '{{ test_inventory_file }}'
+
+
+- name: "read inventory file from: '{{ test_inventory_file }}'"
+  command: "cat '{{ test_inventory_file }}'"
+  changed_when: false
+  register: read_test_inventory_file
+
+
+- name: "show inventory file: '{{ test_inventory_file }}'"
+  debug: var=read_test_inventory_file.stdout_lines

roles/tobiko-inventory/templates/test_inventory.j2

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+[all]
+{% for name, vars in (test_inventory_hostvars | dictsort) %}
+{{ name }} ansible_host={{ vars.ansible_host }}
+{% endfor %}
+
+[all:vars]
+ansible_python_interpreter = {{ test_inventory_python_interpreter }}
+ansible_user = {{ test_inventory_user }}

roles/tobiko-inventory/vars/test-inventory-CentOS-7.yaml

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+---
+
+test_inventory_python_interpreter: /usr/bin/python

roles/tobiko-inventory/vars/test-inventory-RedHat.yaml

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+---
+
+test_inventory_python_interpreter: /usr/libexec/platform-python

roles/tobiko-inventory/vars/test-inventory-Ubuntu.yaml

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+---
+
+test_inventory_python_interpreter: /usr/bin/python3