Support Fedora Rawhide

Fedora rawhide has neither yum, nor python2, nor python2 libselinux
bindings. Ansible needs all of these.

This adds a new play which can be used to get machines setup so they can
then be managed with ansible.

contrib/ansible/cluster.yml

@@ -1,4 +1,12 @@
 ---
+- hosts: all
+  gather_facts: false
+  sudo: yes
+  roles:
+    - pre-ansible
+  tags:
+    - pre-ansible
+
 # Install etcd
 - hosts: etcd
   sudo: yes

contrib/ansible/roles/common/tasks/main.yml

@@ -15,7 +15,7 @@
 
 # collect information about what packages are installed
 - include: rpm.yml
-  when: ansible_pkg_mgr == "yum"
+  when: ansible_pkg_mgr == "yum" or ansible_pkg_mgr == "dnf"
 
 - include: centos.yml
   when: ansible_distribution == "CentOS"

contrib/ansible/roles/pre-ansible/tasks/fedora-dnf.yml

@@ -0,0 +1,8 @@
+---
+- name: Install minimal packages
+  raw: dnf install -y {{ item }}
+  with_items:
+    - python # everyone need python2
+    - python-dnf # some versions of ansible (2.0) use dnf directly
+    - yum # some versions of ansible use yum
+    - libselinux-python

contrib/ansible/roles/pre-ansible/tasks/main.yml

@@ -0,0 +1,11 @@
+---
+- name: Get os_version from /etc/os-release
+  raw: "grep '^VERSION_ID=' /etc/os-release | sed s'/VERSION_ID=//'"
+  register: os_version
+
+- name: Get distro name from /etc/os-release
+  raw: "grep '^NAME=' /etc/os-release | sed s'/NAME=//'"
+  register: distro
+
+- include: fedora-dnf.yml
+  when: os_version.stdout|int >= 22 and 'Fedora' in distro.stdout