Additional test updates

* switch to release-specific zosci functional tests
* switch to yoga zosci unit test job
* add py39

Change-Id: I3447ba421e4d73b12cd633bb4b3c4a60b5dd371f

osci.yaml

@@ -1,6 +1,6 @@
 - project:
     templates:
-      - charm-unit-jobs
+      - charm-yoga-unit-jobs
     check:
       jobs:
       - bionic-postgres
@@ -20,10 +20,9 @@
     parent: func-target
     dependencies:
       - osci-lint
-      - tox-py35
       - tox-py36
-      - tox-py37
       - tox-py38
+      - tox-py39
     vars:
       tox_extra_args: bionic-mysql
 - job:

tox.ini

@@ -75,6 +75,11 @@ basepython = python3.8
 deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
 
+[testenv:py39]
+basepython = python3.9
+deps = -r{toxinidir}/test-requirements.txt
+commands = stestr run --slowest {posargs}
+
 [testenv:pep8]
 basepython = python3
 deps = flake8==3.9.2