Update source of copy new "td-agent.conf" verbatim from main playbook's

[roumano]

For me, on main.yml, line 47 it's not should be :

src: "{{ playbook_dir }}/{{ tdagent_conf_copy }}"

but instead :

src:  "{{ role_path }}/{{ tdagent_conf_copy }}"

it's permit to use several roles & keep configuration of fulentd into fluentd roles