Work around bad DNS resolution

OpenStack-Infra DNS resolution of images.linuxcontainers.org is failing
very often. This works around it by adding the appropriate entries into
/etc/hosts on the host.

Change-Id: I55a06c1903c4435db6d820e6919daa5f10362031

tests/test.yml

@@ -37,6 +37,16 @@
       register: key_get
     - set_fact:
         lxc_container_ssh_key: key_get.stdout
+    # This is a very dirty hack due to images.linuxcontainers.org
+    # constantly failing to resolve in openstack-infra.
+    - name: Implement hard-coded hosts entries for consistently failing name
+      lineinfile:
+        path: "/etc/hosts"
+        line: "{{ item }}"
+        state: present
+      with_items:
+        - "91.189.91.21 images.linuxcontainers.org us.images.linuxcontainers.org"
+        - "91.189.88.37 images.linuxcontainers.org uk.images.linuxcontainers.org"
   roles:
     - role: "lxc_hosts"
       lxc_net_address: 10.100.100.1