Foreman » Installer

Fixes #23905 - Use /usr/share/foreman-proxy as ansible_dir

Using /etc/ansible means that the ~foreman-proxy/.ansible.cfg file we
had set up will be ignored. This means the callback is ignored and any
other options we might set in /etc/foreman-proxy/ansible.cfg

Fixes #22843 - host_key_checking should be False

Closes GH-416

Configure ansible for smart_proxy_ansible

If the ansible proxy plugin is installed, this will make sure that
ansible is configured to use the foreman callback plugin.

Configure smart_proxy_ansible plugin

Closes GH-285