py3: Add gate for python3.9

Add python3.9 gate for nfv.

Story: 2009101
Task: 43100

Signed-off-by: Charles Short <charles.short@windriver.com>
Change-Id: I4b2164e1b2f2f19df590b013e54f8dd42495259a

.zuul.yaml

@@ -10,6 +10,7 @@
         - nfv-tox-pep8
         - nfv-tox-py27
         - nfv-tox-py36
+        - nfv-tox-py39
         - nfv-tox-pylint
         - nova-api-proxy-tox-pep8
         - nova-api-proxy-tox-pylint
@@ -19,6 +20,7 @@
         - nfv-tox-pep8
         - nfv-tox-py27
         - nfv-tox-py36
+        - nfv-tox-py39
         - nfv-tox-pylint
         - nova-api-proxy-tox-pep8
         - nova-api-proxy-tox-pylint
@@ -50,6 +52,20 @@
       bindep_profile: test py36
       python_version: 3.6
 
+- job:
+    name: nfv-tox-py39
+    parent: tox-py39
+    description: Run py39 for nfv
+    nodeset: debian-bullseye
+    required-projects:
+      - starlingx/fault
+      - starlingx/root
+    vars:
+      tox_envlist: py39
+      tox_extra_args: -c nfv/tox.ini
+      bindep_profile: test py39
+      python_version: 3.9
+
 - job:
     name: nfv-tox-pep8
     parent: tox

nfv/tox.ini

@@ -10,7 +10,7 @@
 # and then run "tox" from this directory.
 [tox]
 toxworkdir = /tmp/{env:USER}_nfvtox
-envlist = pep8,py27,py36,pylint
+envlist = pep8,py27,py36,py39,pylint
 skipsdist = True
 stxdir = {toxinidir}/../..
 
@@ -154,6 +154,23 @@ commands = cp -v {[nfv]nfv_base_dir}/nfv-tests/nfv_unit_tests/test_data/nfv_vim_
            stestr --test-path={[nfv]nfv_base_dir}/nfv-tests/nfv_unit_tests/tests run '{posargs}'
            stestr slowest
 
+[testenv:py39]
+basepython = python3.9
+install_command = pip install \
+    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/starlingx/root/raw/branch/master/build-tools/requirements/debian/upper-constraints.txt} \
+    {opts} {packages}
+deps = {[nfv]deps}
+       coverage
+       fixtures
+       mock
+       stestr
+       testtools
+setenv = PYTHONDONTWRITEBYTECODE=True
+commands = cp -v {[nfv]nfv_base_dir}/nfv-tests/nfv_unit_tests/test_data/nfv_vim_db_stx_19.12 {envdir}/
+           stestr --test-path={[nfv]nfv_base_dir}/nfv-tests/nfv_unit_tests/tests run '{posargs}'
+           stestr slowest
+
+
 [testenv:cover]
 basepython = python3
 deps = {[nfv]deps}