Add ansible.cfg for default ansible configs
Add ansible.cfg for default ansible configs

The added ansible.cfg enables some optimizations for ansible such
as mitogen[1] and pipelining[2]. It also specifies the default
inventory file (inventory for the QE envs) and changes the default
output callback to YAML as it is more human readable.

[1] https://mitogen.readthedocs.io/en/stable/ansible.html#connection-delegation
[2] https://docs.ansible.com/ansible/2.4/intro_configuration.html#pipelining

SUSE-Cloud/automation,SUSE-Cloud/automation,gosipyan/automation,gosipyan/automation,aspiers/automation,gosipyan/automation,gosipyan/automation,SUSE-Cloud/automation,aspiers/automation,aspiers/automation,aspiers/automation,SUSE-Cloud/automation