Add stable jobs to the gate

Since neutron-tempest-plugin is branchless, it is necessary to gate
againest all stable branches to avoid breakage in stable branches.

Related-Bug: #1765008
Change-Id: Ib175678c0a655568054a4c2d595b890ff85e00ec

.zuul.yaml

@@ -102,6 +102,13 @@
       - ^tools/.*$
       - ^tox.ini$
 
+- job:
+    name: neutron-tempest-plugin-api-queens
+    parent: neutron-tempest-plugin-api
+    override-checkout: stable/queens
+    vars:
+      branch_override: stable/queens
+
 - job:
     name: neutron-tempest-plugin-scenario-linuxbridge
     parent: neutron-tempest-plugin-scenario
@@ -118,6 +125,13 @@
             AGENT:
               debug_iptables_rules: true
 
+- job:
+    name: neutron-tempest-plugin-scenario-linuxbridge-queens
+    parent: neutron-tempest-plugin-scenario-linuxbridge
+    override-checkout: stable/queens
+    vars:
+      branch_override: stable/queens
+
 - job:
     name: neutron-tempest-plugin-dvr-multinode-scenario
     parent: legacy-dsvm-base-multinode
@@ -142,6 +156,13 @@
       - ^tox.ini$
     voting: false
 
+- job:
+    name: neutron-tempest-plugin-dvr-multinode-scenario-queens
+    parent: neutron-tempest-plugin-dvr-multinode-scenario
+    override-checkout: stable/queens
+    vars:
+      branch_override: stable/queens
+
 - job:
     name: neutron-tempest-plugin-designate-scenario
     parent: neutron-tempest-plugin-scenario
@@ -168,6 +189,13 @@
       - ^setup.cfg$
     voting: false
 
+- job:
+    name: neutron-tempest-plugin-designate-scenario-queens
+    parent: neutron-tempest-plugin-designate-scenario
+    override-checkout: stable/queens
+    vars:
+      branch_override: stable/queens
+
 - project-template:
     name: neutron-tempest-plugin-jobs
     check:
@@ -182,6 +210,19 @@
         - neutron-tempest-plugin-api
         - build-openstack-sphinx-docs
 
+- project-template:
+    name: neutron-tempest-plugin-jobs-stable
+    check:
+      jobs:
+        - neutron-tempest-plugin-api-queens
+        - neutron-tempest-plugin-designate-scenario-queens
+        - neutron-tempest-plugin-dvr-multinode-scenario-queens
+        - neutron-tempest-plugin-scenario-linuxbridge-queens
+    gate:
+      jobs:
+        - neutron-tempest-plugin-api-queens
+
 - project:
     templates:
       - neutron-tempest-plugin-jobs
+      - neutron-tempest-plugin-jobs-stable

playbooks/neutron-tempest-plugin-api/run.yaml

@@ -34,7 +34,7 @@
           export DEVSTACK_GATE_EXERCISES=0
           export DEVSTACK_GATE_TEMPEST_REGEX="neutron_tempest_plugin.api"
           export DEVSTACK_LOCAL_CONFIG="enable_plugin neutron-tempest-plugin git://git.openstack.org/openstack/neutron-tempest-plugin"
-          export BRANCH_OVERRIDE=default
+          export BRANCH_OVERRIDE="{{ branch_override | default('default') }}"
           if [ "$BRANCH_OVERRIDE" != "default" ] ; then
               export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE
           fi