Specifying Python version in the Ansible playbooks

[pjakovits]

I ran into some issues with Ansible using the wrong Python version when xOpera is deploying the test infrastructure using create_ti.yml playbook. The issue seems to be related to how xOpera uses Ansible, but adding:

  vars:
    ansible_python_interpreter: /usr/bin/python3

inside the create_ti.yml Ansible playbook fixed these issues for me. I also added:
become: yes
line to elevate Ansible commands to have permissions to install linux packages.
The start of the reate_ti.yml file after the change:

- name: Run SockShop
  hosts: localhost
  become: yes
  vars:
    ansible_python_interpreter: /usr/bin/python3
  tasks: