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: Iaa2564791033c6286bcd2b9ae327285e92701bad

tests/test-prepare-host.yml

@@ -30,6 +30,24 @@
         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