test-module: define ansible_version attribute
test-module: define ansible_version attribute

Executed command:

    ./hacking/test-module -m lib/ansible/modules/cloud/scaleway/scaleway_security_group.py -a ...

Fix this exception found while testing scaleway_security_group module:

    Traceback (most recent call last):
      File "~/debug_dir/__main__.py", line 240, in <module>
        main()
      File "~/debug_dir/__main__.py", line 236, in main
        core(module)
      File "~/debug_dir/__main__.py", line 209, in core
        api = Scaleway(module=module)
      File "~/debug_dir/ansible/module_utils/scaleway.py", line 58, in __init__
        'User-Agent': self.get_user_agent_string(module),
      File "~/debug_dir/ansible/module_utils/scaleway.py", line 99, in get_user_agent_string
        return "ansible %s Python %s" % (module.ansible_version, sys.version.split(' ')[0])
    AttributeError: 'AnsibleModule' object has no attribute 'ansible_version'

thaim/ansible,thaim/ansible