If a global pip.conf file exists, let the AIO use it for containers

OpenStack-CI implements a global pip configuration which configures
the use of the OpenStack pypi and wheel mirrors.

This patch implements a check for a global pip configuration file,
then adds this file to the list of files to be copied into the
container cache so that all containers have the configuration.

While most containers end up with a localised pip configuration
which locks them down to the repo server (which will ignore the
glocal config), this is very useful for the repo server which
does not get locked down.

Change-Id: I1058b68f2281c5152fcd4b880fa21121716bc05c

tests/roles/bootstrap-host/tasks/prepare_aio_config.yml

@@ -139,34 +139,46 @@
     config_overrides: "{{ user_variables_overrides | default({}) }}"
     config_type: yaml
 
-- name: Add user_apt_conf_files to contain the list of files to copy into containers
+- name: Determine if the host has a global pip config file
+  stat:
+    path: /etc/pip.conf
+  register: pip_conf_file
+
+- name: Add user_conf_files to contain the list of files to copy into containers
   file:
-    path: /etc/openstack_deploy/user_apt_conf_files.yml
+    path: /etc/openstack_deploy/user_conf_files.yml
     state: touch
   when:
-    - apt_conf_files is defined
-    - apt_conf_files.stdout_lines | length > 0
+    - apt_conf_files is defined or pip_conf_file.stat.exists
   tags:
-    - apt-conf-files
+    - container-conf-files
 
-- name: Ensure that the first two lines in user_apt_conf_files are correct
+- name: Ensure that the first two lines in user_conf_files are correct
   lineinfile:
-    dest: /etc/openstack_deploy/user_apt_conf_files.yml
+    dest: /etc/openstack_deploy/user_conf_files.yml
     line: "---\nlxc_container_cache_files:"
     insertbefore: BOF
   when:
-    - apt_conf_files is defined
-    - apt_conf_files.stdout_lines | length > 0
+    - apt_conf_files is defined or pip_conf_file.stat.exists
   tags:
-    - apt-conf-files
+    - container-conf-files
 
-- name: Add the list of dicts into user_apt_conf_files
+- name: Add the dict to copy the global pip config file into user_conf_files
   lineinfile:
-    dest: /etc/openstack_deploy/user_apt_conf_files.yml
+    dest: /etc/openstack_deploy/user_conf_files.yml
+    line: " - { src: '/etc/pip.conf', dest: '/etc/pip.conf' }"
+  when:
+    - pip_conf_file.stat.exists
+  tags:
+    - container-conf-files
+
+- name: Add the list of dicts for the apt config files into user_conf_files
+  lineinfile:
+    dest: /etc/openstack_deploy/user_conf_files.yml
     line: " - { src: '/etc/apt/apt.conf.d/{{ item }}', dest: '/etc/apt/apt.conf.d/{{ item }}' }"
   with_items: apt_conf_files.stdout_lines
   when:
     - apt_conf_files is defined
     - apt_conf_files.stdout_lines | length > 0
   tags:
-    - apt-conf-files
+    - container-conf-files