Tests: Make containers use the host's apt/pip config

This patch sets the test to check if the test is running in
OpenStack-CI, and if it is - then make the containers use
the host's pip.conf and some of the apt configuration.

All containers should make use of the hosts's apt sources
configuration. The tasks detect and implement this.

The intent is to make use of OpenStack-CI resources better
and consequently reduce the test run time.

Change-Id: I56012c4dd79477180f87cc25c5175ac08baf470e

tests/test-prep.yml

@@ -44,6 +44,24 @@
         manage_dir: no
     - set_fact:
         lxc_container_ssh_key: "{{ hostvars['127.0.0.1']['lxc_container_ssh_key'] }}"
+    - name: Check if this is an OpenStack-CI nodepool instance
+      stat:
+        path: /etc/nodepool/provider
+      register: nodepool
+    - name: Set the files to copy into the container cache for OpenStack-CI instances
+      set_fact:
+        lxc_container_cache_files:
+          - { src: '/etc/pip.conf', dest: '/etc/pip.conf' }
+          - { src: '/etc/apt/apt.conf.d/99unauthenticated', dest: '/etc/apt/apt.conf.d/99unauthenticated' }
+      when: nodepool.stat.exists | bool
+    - name: Determine the existing Ubuntu repo configuration
+      shell: 'awk "/^deb .*ubuntu\/? {{ ansible_distribution_release }} main/ {print \$2; exit}" /etc/apt/sources.list'
+      register: ubuntu_repo
+      changed_when: false
+    - name: Set apt repo facts based on discovered information
+      set_fact:
+        lxc_container_template_main_apt_repo: "{{ ubuntu_repo.stdout }}"
+        lxc_container_template_security_apt_rep: "{{ ubuntu_repo.stdout }}"
   roles:
     - role: "lxc_hosts"
       lxc_net_address: 10.100.100.1