Disable fastestmirror on CentOS

It actually slows down things dramatically when used in combination
with Ansible.

roles/bootstrap-os/tasks/bootstrap-centos.yml

@@ -0,0 +1,14 @@
+---
+
+- name: Check presence of fastestmirror.conf
+  stat: path=/etc/yum/pluginconf.d/fastestmirror.conf
+  register: fastestmirror
+
+# fastestmirror plugin actually slows down Ansible deployments
+- name: Disable fastestmirror plugin
+  lineinfile:
+    dest: /etc/yum/pluginconf.d/fastestmirror.conf
+    regexp: "^enabled=.*"
+    line: "enabled=0"
+    state: present
+  when: fastestmirror.stat.exists