Use python3 for functional tests

* Run by default with python3.
* Add python2 functinal-api job.

Change-Id: Ic5c3c4ef57284767665d3c5dc92c59671218ebe1
Signed-off-by: Spyros Trigazis <spyridon.trigazis@cern.ch>

.zuul.yaml

@@ -61,6 +61,46 @@
       neutron: 1
       tempest: 0
       branch_override: default
+      devstack_python3: 1
+
+- job:
+    name: magnum-functional-base-python2
+    parent: legacy-dsvm-base
+    timeout: 7800
+    nodeset: legacy-ubuntu-xenial
+    pre-run: playbooks/pre/prepare-workspace.yaml
+    run: playbooks/magnum-functional-base.yaml
+    post-run: playbooks/post/upload-logs.yaml
+    required-projects:
+      - openstack-infra/devstack-gate
+      - openstack/diskimage-builder
+      - openstack/ironic
+      - openstack/ironic-lib
+      - openstack/ironic-python-agent
+      - openstack/magnum
+      - openstack/magnum-tempest-plugin
+      - openstack/pyghmi
+      - openstack/python-ironicclient
+      - openstack/python-magnumclient
+      - openstack/virtualbmc
+    irrelevant-files:
+      - ^.*\.rst$
+      - ^api-ref/.*$
+      - ^doc/.*$
+      - ^specs/.*$
+      - ^install-guide/.*$
+      - ^releasenotes/.*$
+      - ^dockerfiles/.*$
+    vars:
+      ironic: 0
+      ceilometer: 0
+      swift: 0
+      horizon: 0
+      multinode: 0
+      neutron: 1
+      tempest: 0
+      branch_override: default
+      devstack_python3: 0
 
 - job:
     name: magnum-functional-multinode-base
@@ -98,6 +138,7 @@
       neutron: 1
       tempest: 0
       branch_override: default
+      devstack_python3: 1
 
 - job:
     name: magnum-functional-api
@@ -105,6 +146,12 @@
     vars:
       coe: api
 
+- job:
+    name: magnum-functional-api-python2
+    parent: magnum-functional-base-python2
+    vars:
+      coe: api
+
 - job:
     name: magnum-functional-coe
     parent: magnum-functional-base
@@ -333,6 +380,7 @@
     check:
       jobs:
         - magnum-functional-api
+        - magnum-functional-api-python2
         - magnum-functional-k8s
         - magnum-functional-swarm-mode
         - openstack-tox-cover:
@@ -342,6 +390,7 @@
       queue: magnum
       jobs:
         - magnum-functional-api
+        - magnum-functional-api-python2
     experimental:
       jobs:
         - magnum-functional-dcos

playbooks/magnum-functional-base.yaml

@@ -19,6 +19,12 @@
           set -x
           export PYTHONUNBUFFERED=true
 
+          if [ "{{ devstack_python3 }}" -eq 1 ] ; then
+              export DEVSTACK_GATE_USE_PYTHON3=True
+          else
+              export DEVSTACK_GATE_USE_PYTHON3=False
+          fi
+
           if [ "{{ neutron }}" -eq 1 ] ; then
               export DEVSTACK_GATE_NEUTRON=1
           fi