Allow override of RDO repo baseurl

This patch allows deployers to set pip_install_centos_mirror_url
and override the default RDO repository (mirrors.centos.org).

Change-Id: I7b0dd5d14c82a74be955071e638c122ffb45ab31

defaults/main.yml

@@ -127,3 +127,7 @@ pip_install_options: ""
 
 # Always force getting the latest get-pip script
 pip_get_pip_force: yes
+
+# Set default mirror for CentOS repositories
+# NOTE(mhayden): Ensure that the full path to the 'centos' directory is used.
+#pip_install_centos_mirror_url: 'http://mirror.centos.org/centos'

releasenotes/notes/centos-mirror-url-variable-eea9f226b5611b40.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Deployers can set ``pip_install_centos_mirror_url`` to use their
+    preferred mirror for the RDO repositories.

tasks/pre_install_yum.yml

@@ -28,6 +28,23 @@
   tags:
     - add-repo-keys
 
+- name: Ensure RDO repositories are using the correct CentOS mirror
+  command: |
+    yum-config-manager
+      --save
+      --setopt="{{ item.repo_name }}.baseurl={{ item.baseurl }}"
+  changed_when: false
+  with_items:
+    - repo_name: rdo-qemu-ev
+      baseurl: "{{ pip_install_centos_mirror_url }}/7/virt/$basearch/kvm-common/"
+    - repo_name: openstack-ocata
+      baseurl: "{{ pip_install_centos_mirror_url }}/7/cloud/$basearch/openstack-ocata/"
+  when:
+    - user_external_repo_key is not defined
+    - pip_install_centos_mirror_url is defined
+  tags:
+    - add-repo-keys
+
 - name: Install EPEL and yum priorities plugin
   package:
     name: "{{ pip_epel_prep_distro_packages }}"