Bump virtualenv to version prior to 20.2.2

Recently released virtualenv breaks linter jobs. In order to prevent this
we temporary fix it's version before this release

Make centos-8 job non-voting as fixing centos 8.3 creates a circular
dependancy on this patch.

Change-Id: I1dc269944445a1493c0008d9f318db56d9f0274f

run_tests_common.sh

@@ -73,14 +73,13 @@ eval sudo ${pkg_mgr_cmd} ${pkg_list}
 
 PIP_EXEC_PATH=$(which pip3 || which pip)
 
-# Install bindep and tox
 if [[ "${ID,,}" == "centos" ]] && [[ ${VERSION_ID} == "8" ]]; then
     sudo alternatives --set python /usr/bin/python3
-    sudo "${PIP_EXEC_PATH}" install 'bindep>=2.4.0' tox
-else
-    sudo "${PIP_EXEC_PATH}" install 'bindep>=2.4.0' tox
 fi
 
+# Install bindep and tox
+sudo "${PIP_EXEC_PATH}" install 'bindep>=2.4.0' tox 'virtualenv<20.2.2'
+
 if [[ "${ID,,}" == "fedora" ]]; then
     sudo dnf -y install redhat-lsb-core yum-utils
 # openSUSE 42.1 does not have python-ndg-httpsclient

zuul.d/project.yaml

@@ -19,3 +19,11 @@
       - check-requirements
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
+    check:
+      jobs:
+        - openstack-ansible-functional-centos-8:
+            voting: false
+    gate:
+      jobs:
+        - openstack-ansible-functional-centos-8:
+            voting: false