[Yoga Only] Switch FIPS functional job to python3.8

Since [1] newly introduced 2 ft tests fails in
CentOS8 Stream based fips job. The tests works
fine in similar ubuntu non fips job which runs
with python3.8. Let's switch the fips jobs to
run with python3.8.

Also add fips job to experimental queue.

Related-Bug: #2039650
Change-Id: I8f89605bbdd7a748e9bb0939de86acb150fda94d

Author: karelyatin

roles/configure_functional_tests/tasks/main.yaml

@@ -34,6 +34,9 @@
             # NOTE(slaweq) On Fedora/CentOS systems make sure that SELinux is
             # not in enforcing mode
             sudo setenforce 0
+            if [[ $os_VENDOR == "CentOSStream" && $os_RELEASE -eq 8 ]]; then
+                install_package python3.8 python38-devel
+            fi
         fi
 
         configure_host_for_func_testing

tox.ini

@@ -5,7 +5,7 @@ skipsdist = False
 ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
+basepython = {env:TOX_PYTHON:python3}
 setenv = VIRTUAL_ENV={envdir}
          OS_LOG_CAPTURE={env:OS_LOG_CAPTURE:true}
          OS_STDOUT_CAPTURE={env:OS_STDOUT_CAPTURE:true}

zuul.d/base.yaml

@@ -130,6 +130,8 @@
     description: |
       Functional testing for a FIPS enabled Centos 8 system
     vars:
+      tox_environment:
+        TOX_PYTHON: python3.8
       nslookup_target: 'opendev.org'
       enable_fips: True
       devstack_localrc:

zuul.d/job-templates.yaml

@@ -47,6 +47,7 @@
     name: neutron-experimental-jobs
     experimental:
       jobs:
+        - neutron-functional-with-uwsgi-fips
         - neutron-ovn-grenade-multinode
         - neutron-ovn-tempest-with-uwsgi-loki
         - tempest-integrated-networking: