[CI] Use compatible version of heat-tempest-plugin

This is a combination of four patch to fix the gate:

1. Use compatible version of heat-tempest-plugin

heat-tempest-plugin dropped py38 support, hence it cannot be installed
from recent master, so we need to override the checkout to the version
that still supports py38 and compatible to the actual branch.

This is needed both for the grenade job and the functional job, because
these are using the heat-tempest-plugin.

2. Try archive path to download Fedora image

This is a temporal workaround to allow downloading Fedora 37 image
which was moved to the archive path.

3. Remove reference to devstack-gate

devstack-gate was deprecated in xena and is being retired now[1].

4. [stable-only] Cap setuptools <71.0.0

py39 jobs (on ubuntu-focal) started to fail due to recent virtualenv
release (20.26.4) on Yoga (which bundles setuptools), because we have
'packaging==21.3' in this branch that is not compatible with newer
setuptools [2].

setuptools is bundled in virtualenv, so it has to be capped via the
virtualenv package. tox also needed to be capped (<4) as gate uses
tox 3.28.0, but with capping virtualenv we pull in latest tox as well,
which would cause other errors.

[1] https://review.opendev.org/c/openstack/governance/+/919629
[2] https://github.com/pypa/setuptools/issues/4483

Changes:
  .zuul.yaml

NOTE(elod.illes): change in .zuul.yaml is to adapt the patch to the
current branch ('<series>-last' needs to be used).

Change-Id: I9b1702749976a2cea42a24130e5fec2931b75ce1
(cherry picked from commit a806b400cf5766f1e675798e501aa32416dc0939)
(cherry picked from commit ae6225890e5e604bd8ed71a5964838a690229f45)
(cherry picked from commit 4fd9953a55c15e1d6d0bfb8f648d03d9e368fc3b)
(cherry picked from commit 81a8b93254842150db98b5fc1388188d67e223f0)
(cherry picked from commit 665ccfc2626f88b422d1c0db07d63556f208a908)
(cherry picked from commit c18b344591c8f2cdb9555c1a8753c7f1bda5fed1)

.zuul.yaml

@@ -10,11 +10,11 @@
       - zuul: opendev.org/openstack/devstack
       - zuul: opendev.org/openstack/tempest
     required-projects:
-      - openstack/devstack-gate
       - openstack/barbican
       - openstack/heat
       - openstack/heat-templates
-      - openstack/heat-tempest-plugin
+      - name: opendev.org/openstack/heat-tempest-plugin
+        override-checkout: yoga-last
       - openstack/octavia
       - openstack/neutron
       - openstack/oslo.messaging
@@ -135,7 +135,8 @@
     parent: grenade-multinode
     required-projects:
       - opendev.org/openstack/heat
-      - opendev.org/openstack/heat-tempest-plugin
+      - name: opendev.org/openstack/heat-tempest-plugin
+        override-checkout: yoga-last
       - opendev.org/openstack/python-heatclient
     vars:
       grenade_devstack_localrc:

devstack/lib/heat

@@ -463,11 +463,14 @@ function configure_tempest_for_heat {
         source /etc/ci/mirror_info.sh
     fi
     HEAT_TEST_FEDORA_IMAGE_UPSTREAM=https://download.fedoraproject.org/pub/fedora/linux
+    HEAT_TEST_FEDORA_IMAGE_UPSTREAM_ARCHIVE=https://download.fedoraproject.org/pub/archive/fedora/linux/
     HEAT_TEST_FEDORA_IMAGE_PATH=releases/37/Cloud/x86_64/images/Fedora-Cloud-Base-37-1.7.x86_64.qcow2
-    if curl --output /dev/null --silent --head --fail "${NODEPOOL_FEDORA_MIRROR}/${HEAT_TEST_FEDORA_IMAGE_PATH}"; then
+    if curl --location --output /dev/null --silent --head --fail "${NODEPOOL_FEDORA_MIRROR}/${HEAT_TEST_FEDORA_IMAGE_PATH}"; then
         export HEAT_TEST_FEDORA_IMAGE="${NODEPOOL_FEDORA_MIRROR}/${HEAT_TEST_FEDORA_IMAGE_PATH}"
-    else
+    elif curl --location --output /dev/null --silent --head --fail "${HEAT_TEST_FEDORA_IMAGE_UPSTREAM}/${HEAT_TEST_FEDORA_IMAGE_PATH}"; then
         export HEAT_TEST_FEDORA_IMAGE="${HEAT_TEST_FEDORA_IMAGE_UPSTREAM}/${HEAT_TEST_FEDORA_IMAGE_PATH}"
+    else
+        export HEAT_TEST_FEDORA_IMAGE="${HEAT_TEST_FEDORA_IMAGE_UPSTREAM_ARCHIVE}/${HEAT_TEST_FEDORA_IMAGE_PATH}"
     fi
     TOKEN=$(openstack token issue -c id -f value)
     local image_exists=$( openstack image list | grep "Fedora-Cloud-Base-37-1.7.x86_64" )

tox.ini

@@ -3,6 +3,12 @@ envlist = py36,py37,py38,py39,pep8
 ignore_basepython_conflict = True
 minversion = 3.1.0
 skipsdist = True
+# Cap setuptools via virtualenv to prevent compatibility issue with yoga
+# branch's upper constraint of 'packaging' package (21.3).
+requires =
+  virtualenv<20.26.4
+  tox<4
+  setuptools<71.0.0
 
 [testenv]
 basepython = python3