Support multi backends for Zaqar tempest job

Now Zaqar supports mongodb and redis as backends. So it would be
nice if the tempest job can support both.

Change-Id: Ie56471c866ff890988d2ced10253051552c73123

jenkins/jobs/projects.yaml

@@ -9229,6 +9229,18 @@
           job-suffix: ''
           branch-override: default
           backend: redis
+      - '{pipeline}-tempest-dsvm-{backend}-zaqar{job-suffix}':
+          pipeline: gate
+          node: ubuntu-trusty
+          job-suffix: ''
+          branch-override: default
+          backend: mongodb
+      - '{pipeline}-tempest-dsvm-{backend}-zaqar{job-suffix}':
+          pipeline: gate
+          node: ubuntu-trusty
+          job-suffix: ''
+          branch-override: default
+          backend: redis
 
 - project:
     name: zaqar-specs

jenkins/jobs/zaqar.yaml

@@ -89,9 +89,9 @@
       - devstack-logs
       - console-log
 
-- job:
-    name: gate-tempest-dsvm-zaqar
-    node: ubuntu-trusty
+- job-template:
+    name: '{pipeline}-tempest-dsvm-{backend}-zaqar{job-suffix}'
+    node: '{node}'
 
     wrappers:
       - build-timeout:
@@ -109,10 +109,10 @@
           export ENABLED_SERVICES=tempest
           export DEVSTACK_LOCAL_CONFIG="enable_plugin zaqar git://git.openstack.org/openstack/zaqar"
 
-          function gate_hook {
+          function gate_hook {{
               cd /opt/stack/new/zaqar/devstack/gate
-              ./gate_hook.sh tempest
-          }
+              ./gate_hook.sh tempest {backend}
+          }}
           export -f gate_hook
 
           cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh

zuul/layout.yaml

@@ -1291,7 +1291,9 @@ jobs:
   - name: gate-zaqar-tox-integration
     voting: false
 
-  - name: gate-tempest-dsvm-zaqar
+  # NOTE(flwang) Make tempest jobs non-voting until Zaqar's tempest
+  # environment stablizes
+  - name: ^gate-tempest-dsvm-.*-zaqar$
     voting: false
 
   - name: gate-tempest-dsvm-neutron-nv
@@ -12084,7 +12086,8 @@ projects:
       - gate-dsvm-mongodb-zaqar
       - gate-dsvm-redis-zaqar
       - gate-rally-dsvm-zaqar-zaqar
-      - gate-tempest-dsvm-zaqar
+      - gate-tempest-dsvm-mongodb-zaqar
+      - gate-tempest-dsvm-redis-zaqar
     gate:
       - gate-dsvm-mongodb-zaqar
       - gate-dsvm-redis-zaqar