Fix building OVS after python2 removal

Switch functional to use python3 to install python3-based
dependencies, which the OVS build checks for. Also, remove
the py36 test

Change-Id: I2d9599d7050a15f459e6845a112ffc9948b2a7bd

tox.ini

@@ -43,6 +43,7 @@ basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:functional]
+basepython = python3
 setenv = {[testenv]setenv}
          OS_TEST_PATH=./ovsdbapp/tests/functional
          OVS_SRCDIR={envdir}/src/ovs
@@ -51,12 +52,6 @@ commands =
          {toxinidir}/tools/setup-ovs.sh
          {[testenv]commands}
 
-[testenv:functional-py36]
-basepython = python3.6
-setenv = {[testenv:functional]setenv}
-passenv = {[testenv:functional]passenv}
-commands = {[testenv:functional]commands}
-
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 

zuul.d/project.yaml

@@ -7,11 +7,9 @@
       jobs:
         - openstack-tox-lower-constraints
         - openstack-tox-functional
-        - openstack-tox-functional-py36
         - ovsdbapp-tempest-dsvm-networking-ovn-ovs-release
     gate:
       jobs:
         - openstack-tox-lower-constraints
         - openstack-tox-functional
-        - openstack-tox-functional-py36
         - ovsdbapp-tempest-dsvm-networking-ovn-ovs-release