Make devstack run on focal (Ubuntu LTS 20.04)

- Add a nodeset and a platform job
- Drop uwsgi-py2 pkg that no longer exists
- Blacklist tests that are currently failing

Change-Id: Ib4416dc2f5e003fd770f5240a8f78213c56af8e6

.zuul.yaml

@@ -8,6 +8,16 @@
         nodes:
           - controller
 
+- nodeset:
+    name: openstack-single-node-focal
+    nodes:
+      - name: controller
+        label: ubuntu-focal
+    groups:
+      - name: tempest
+        nodes:
+          - controller
+
 - nodeset:
     name: openstack-single-node-bionic
     nodes:
@@ -512,6 +522,14 @@
     parent: tempest-full-py3
     description: openSUSE 15.x platform test
     nodeset: devstack-single-node-opensuse-15
+
+- job:
+    name: devstack-platform-focal
+    parent: tempest-full-py3
+    description: Ubuntu Focal Fossa platform test
+    nodeset: openstack-single-node-focal
+    vars:
+      tempest_black_regex: "(tempest.api.compute.volumes.test_attach_volume.AttachVolumeMultiAttachTest.test_resize_server_with_multiattached_volume|tempest.api.compute.servers.test_server_rescue_negative.ServerRescueNegativeTestJSON|tempest.api.compute.servers.test_server_rescue.ServerStableDeviceRescueTest.test_stable_device_rescue_disk_virtio_with_volume_attached)"
     voting: false
 
 - job:
@@ -605,6 +623,7 @@
         - devstack-platform-opensuse-15
         - devstack-platform-fedora-latest
         - devstack-platform-centos-8
+        - devstack-platform-focal
         - devstack-multinode
         - devstack-unit-tests
         - openstack-tox-bashate

lib/apache

@@ -96,10 +96,11 @@ function install_apache_uwsgi {
     fi
 
     if is_ubuntu; then
-        install_package uwsgi \
-                        uwsgi-plugin-python \
-                        uwsgi-plugin-python3 \
-                        libapache2-mod-proxy-uwsgi
+        local pkg_list="uwsgi uwsgi-plugin-python3 libapache2-mod-proxy-uwsgi"
+        if "$DISTRO" == 'bionic'; then
+            pkg_list="${pkg_list} uwsgi-plugin-python"
+        fi
+        install_package ${pkg_list}
     elif is_fedora; then
         # Note httpd comes with mod_proxy_uwsgi and it is loaded by
         # default; the mod_proxy_uwsgi package actually conflicts now.

stack.sh

@@ -221,7 +221,7 @@ write_devstack_version
 
 # Warn users who aren't on an explicitly supported distro, but allow them to
 # override check and attempt installation with ``FORCE=yes ./stack``
-if [[ ! ${DISTRO} =~ (bionic|stretch|jessie|f30|f31|opensuse-15.0|opensuse-15.1|opensuse-tumbleweed|rhel8) ]]; then
+if [[ ! ${DISTRO} =~ (bionic|focal|stretch|jessie|f30|f31|opensuse-15.0|opensuse-15.1|opensuse-tumbleweed|rhel8) ]]; then
     echo "WARNING: this script has not been tested on $DISTRO"
     if [[ "$FORCE" != "yes" ]]; then
         die $LINENO "If you wish to run this script anyway run with FORCE=yes"