Disable fastestmirror on CentOS

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

inventory/group_vars/all.yml

-# Valid bootstrap options (required): ubuntu, coreos, none
+# Valid bootstrap options (required): ubuntu, coreos, centos, none
 bootstrap_os: none
 
 # Directory where the binaries will be installed

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

+---
+
+- 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

roles/bootstrap-os/tasks/main.yml

@@ -5,4 +5,7 @@
 - include: bootstrap-coreos.yml
   when: bootstrap_os == "coreos"
 
-- include: setup-pipelining.yml
+- include: bootstrap-centos.yml
+  when: bootstrap_os == "centos"
+
+- include: setup-pipelining.yml
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