Add tarballed amphora.

This commit modifies the base kuryr-kubernetes/octavia job so it
downloads and uses a tarballed amphora image instead of building it on
the CI for each run.

Change-Id: Ie80e663b906e6f76826319ccccce831aceb9e606

.zuul.yaml

@@ -140,9 +140,13 @@
       - openstack/octavia
       - openstack/python-barbicanclient
       - openstack/python-octaviaclient
+    pre-run: playbooks/get_amphora_tarball.yaml
     vars:
       devstack_localrc:
         LIBS_FROM_GIT: python-octaviaclient
+        OCTAVIA_AMP_IMAGE_FILE: "/tmp/test-only-amphora-x64-haproxy-centos-7.qcow2"
+        OCTAVIA_AMP_IMAGE_SIZE: 3
+        OCTAVIA_AMP_IMAGE_NAME: "test-only-amphora-x64-haproxy-centos-7"
       devstack_local_conf:
         post-config:
           $OCTAVIA_CONF:

playbooks/get_amphora_tarball.yaml

@@ -0,0 +1,6 @@
+- hosts: controller
+  tasks:
+    - name: Download amphora tarball
+      get_url:
+        url: "https://tarballs.openstack.org/octavia/test-images/test-only-amphora-x64-haproxy-centos-7.qcow2"
+        dest: /tmp/test-only-amphora-x64-haproxy-centos-7.qcow2