Swift upgrade testing.

Implement upgrade testing for os_swift role.

This patch adds an upgrade testenv, which configures a previous version
of swift, and the test-vars from the previous stable branch to be used
by the previous version of swift.

We don't run functional tests after the initial stable/newton deploy
because a working stable/newton branch is already tested, and it's
assumed it worked if the upgrade works too - which is more efficient.

This follows the pattern setup for Keystone in:
https://review.openstack.org/#/c/384269/

Change-Id: Icefc1c75b814b9d7dc5e79422e975346b9482e9d
Implements: blueprint upgrade-testing

tests/ansible-role-requirements.yml

@@ -46,3 +46,7 @@
   src: https://git.openstack.org/openstack/openstack-ansible-rsyslog_client
   scm: git
   version: master
+- name: os_previous_swift
+  src: https://git.openstack.org/openstack/openstack-ansible-os_swift
+  scm: git
+  version: stable/newton

tests/test-install-previous-swift.yml

@@ -0,0 +1,23 @@
+---
+# Copyright 2016, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- name: Playbook for deploying swift
+  hosts: "{{ swift_groups | default('swift_all:swift_remote_all') }}"
+  user: root
+  gather_facts: true
+  roles:
+    - role: "os_previous_swift"
+  vars_files:
+    - common/previous/test-vars.yml

tests/test.yml

@@ -22,5 +22,14 @@
 # Install Keystone
 - include: common/test-install-keystone.yml
 
+# Setup Swift-hosts
+- include: common/test-setup-swifthosts.yml
+
+# Install previous swift
+- include: test-install-previous-swift.yml
+  when:
+    - swift_upgrade is defined
+    - swift_upgrade | bool
+
 # Install Swift
 - include: common/test-install-swift.yml

tox.ini

@@ -111,6 +111,21 @@ commands =
     bash -c "{toxinidir}/tests/common/test-ansible-functional.sh"
 
 
+[testenv:upgrade]
+deps =
+    {[testenv:ansible]deps}
+setenv =
+    {[testenv]setenv}
+    ANSIBLE_PARAMETERS=-vvv -e swift_upgrade=True
+commands =
+    {[testenv:tests_clone]commands}
+    bash -c "if [ ! -d "{toxinidir}/tests/common/previous" ]; then \
+               git clone https://git.openstack.org/openstack/openstack-ansible-tests -b stable/newton \
+                 {toxinidir}/tests/common/previous; \
+             fi"
+    bash -c "{toxinidir}/tests/common/test-ansible-functional.sh"
+
+
 [testenv:func_pypy]
 deps =
     {[testenv:ansible]deps}