Add support for RPM packages

This commit extends the installation of Python interpreter
from system packages to also support RPM packages (assuming
the playbook is run in an environment with proper repositories).

Also the obsolete note about supporting only Debian distribution
is removed, as the `ensure-python` role already supports other
platforms (via pyenv and stow).

Change-Id: Id6ef8ec3537952348e0a7b233bd26b57613da327

roles/ensure-python/README.rst

@@ -1,12 +1,9 @@
 Ensure specified python interpreter and development files are installed
 
-.. note:: This role is only available for Debian based platforms
-          currently.
-
 There are three ways to install the python interpreter:
 
 1. Using distribution packages: This is the default (``python_use_pyenv`` and
-   ``python_use_stow`` are both false``).
+   ``python_use_stow`` are both ``false``).
 
 2. Install using ``pyenv``.
 

roles/ensure-python/tasks/main.yaml

@@ -6,17 +6,28 @@
       - (python_version|string).split(".")[1]
   when: python_version is defined
 
-- name: Install specified version of python interpreter and development files
+- name: Install python using system packages
   when:
     - python_version is defined
-    - ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'
     - not python_use_pyenv
     - not python_use_stow
+  block:
+    - name: Install specified version of python interpreter and development files (DEB)
+      when:
+        - ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'
       package:
         name: python{{ python_version }}-dev
         state: present
       become: yes
 
+    - name: Install specified version of python interpreter and development files (RPM)
+      when:
+        - ansible_distribution == 'CentOS' or ansible_distribution == 'RedHat'
+      package:
+        name: python{{ python_version | replace('.', '') }}-devel
+        state: present
+      become: yes
+
 - name: Install python using pyenv
   when:
     - python_version is defined