Download octavia image in tests

Instead of rebuilding one.

Change-Id: I393158a2fac6d4399a7dde6a0f2e482751359072

.zuul.yaml

@@ -27,6 +27,7 @@
       - ^heat/locale/.*$
       - ^heat/tests/.*$
       - ^releasenotes/.*$
+    pre-run: playbooks/get_amphora_tarball.yaml
     vars:
       disable_convergence: 'false'
       sql: mysql

playbooks/devstack/functional/run.yaml

@@ -65,6 +65,9 @@
           export PROJECTS="openstack/neutron-lbaas $PROJECTS"
           export DEVSTACK_LOCAL_CONFIG+=$'\n'"enable_plugin neutron-lbaas https://git.openstack.org/openstack/neutron-lbaas"
           export DEVSTACK_LOCAL_CONFIG+=$'\n'"enable_plugin octavia https://git.openstack.org/openstack/octavia"
+          export DEVSTACK_LOCAL_CONFIG+=$'\n'"OCTAVIA_AMP_IMAGE_FILE=/tmp/test-only-amphora-x64-haproxy-ubuntu-xenial.qcow2"
+          export DEVSTACK_LOCAL_CONFIG+=$'\n'"OCTAVIA_AMP_IMAGE_SIZE=3"
+          export DEVSTACK_LOCAL_CONFIG+=$'\n'"OCTAVIA_AMP_IMAGE_NAME=test-only-amphora-x64-haproxy-ubuntu-xenial"
           # enabling lbaas plugin does not enable the lbaasv2 service, explicitly enable it
           services+=,q-lbaasv2,octavia,o-cw,o-hk,o-hm,o-api
           export PROJECTS="openstack/barbican $PROJECTS"

playbooks/get_amphora_tarball.yaml

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