Separate Ansible installation out into its own role

roles/ansible-pull/meta/main.yml

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+#!/usr/bin/env ansible-playbook
+# vim:ft=ansible:
+---
+dependencies:
+  role: ansible

roles/ansible/README.md

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+# ansible-pull
+
+This role configures and enables a period `ansible-pull` task through systemd, allowing for machines to ensure proper configuration periodically and of their own volition.

roles/ansible/tasks/main.yml

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+#!/usr/bin/env ansible-playbook
+# vim:ft=ansible:
+- name: install ansible
+  pip: name=ansible<5,ansible-lint state=latest
+  when: ansible_os_family != "Gentoo"