Add Ubuntu ppc64le support

This commit adds support for container creation on Ubuntu ppc64le.
It maps the ansible architecture to the correct lxc architecture
and sets the container arch accordingly.

Change-Id: I1f142686d7190e5bfe7147366d406381b5011725

defaults/main.yml

@@ -15,6 +15,11 @@
 
 lxc_container_config: /etc/lxc/lxc-openstack.conf
 
+# Mappings from Ansible reported architecture to distro release architecture
+lxc_architecture_mapping:
+  x86_64: amd64
+  ppc64le: ppc64el
+
 # lxc container rootfs directory and cache path
 lxc_container_directory: "/var/lib/lxc"
 lxc_container_cache_path: "/var/cache/lxc"

releasenotes/notes/ubuntu-ppc64le-cab45e63dca77017.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Support added to allow deploying on ppc64le architecture
+    using the Ubuntu distributions.

vars/ubuntu-14.04.yml

@@ -49,7 +49,7 @@ lxc_container_interface_target: "/etc/network/interfaces.d/{{ item.value.interfa
 
 lxc_container_map:
   distro: ubuntu
-  arch: amd64
+  arch: "{{ lxc_architecture_mapping.get( hostvars[physical_host]['ansible_architecture'] | lower ) }}"
   release: trusty
   prep_commands: |
     mkdir -p /var/backup

vars/ubuntu-16.04.yml

@@ -49,7 +49,7 @@ lxc_container_interface_target: "/etc/network/interfaces.d/{{ item.value.interfa
 
 lxc_container_map:
   distro: ubuntu
-  arch: amd64
+  arch: "{{ lxc_architecture_mapping.get( hostvars[physical_host]['ansible_architecture'] | lower ) }}"
   release: xenial
   prep_commands: |
     mkdir -p /var/backup