Rename variable "name" as it conflicts with Ansible

[gchazot]

As per comment here: https://github.com/EDITD/pypi/pull/6#discussion_r368475032

• This role needs fixing since Ansible now reserves "name" to be the display name of a role/task. The variable "name" used in this role as the supervisor task's name needs to be changed (to program_name for example)
• Our own playbook for pypi (https://github.com/EDITD/pypi) should be updated to remove the duplication of this role an use a reference to this one instead