Include OS specific variables

The package naming for pip has changed in centos8. Previously the pip
package was called python-pip for python2 and python3-pip for python3.
In CentOS 8 the packages are now called python2-pip for python2 ad
python3-pip for python3.

tasks/main.yml

@@ -1,4 +1,11 @@
 ---
+- name: Gather OS specific variables.
+  include_vars: "{{ item }}"
+  with_first_found:
+      - "vars/{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
+      - "vars/{{ ansible_distribution }}.yml"
+      - "defaults/main.yml"
+
 - name: Ensure Pip is installed.
   package:
     name: "{{ pip_package }}"

vars/CentOS-8.yml

@@ -0,0 +1,2 @@
+---
+pip_package: python3-pip