Add tap-as-a-service experimental tempest job

I plan to make tap-as-a-service provide a tempest plugin.
DEVSTACK_GATE_TEMPEST_REGEX will be defined by devstackgaterc.

Change-Id: Ib647751b6258716347e3c110e9762546298d6e67

jenkins/jobs/projects.yaml

@@ -6704,6 +6704,11 @@
 
     jobs:
       - python-jobs
+      - '{pipeline}-tempest-dsvm-tap-as-a-service{job-suffix}':
+          pipeline: gate
+          node: 'devstack-precise || devstack-trusty'
+          job-suffix: ''
+          branch-override: default
 
 - project:
     name: taskflow

jenkins/jobs/tap-as-a-service.yaml

@@ -0,0 +1,38 @@
+- job-template:
+    name: '{pipeline}-tempest-dsvm-tap-as-a-service{job-suffix}'
+    node: '{node}'
+
+    wrappers:
+      - build-timeout:
+          timeout: 125
+      - timestamps
+
+    builders:
+      - link-logs
+      - net-info
+      - devstack-checkout
+      - shell: |
+          #!/bin/bash -xe
+          export PYTHONUNBUFFERED=true
+          export DEVSTACK_GATE_TIMEOUT=120
+          export DEVSTACK_GATE_TEMPEST=1
+          export DEVSTACK_GATE_NEUTRON=1
+          exoprt DEVSTACK_GATE_TEMPEST_ALL_PLUGINS=1
+          export BRANCH_OVERRIDE={branch-override}
+          if [ "$BRANCH_OVERRIDE" != "default" ] ; then
+              export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE
+          fi
+
+          # Enable tap-as-a-service
+          export PROJECTS="openstack/tap-as-a-service $PROJECTS"
+          export DEVSTACK_LOCAL_CONFIG="enable_plugin tap-as-a-service git://git.openstack.org/openstack/tap-as-a-service"
+          ENABLED_SERVICES=taas,taas_openvswitch_agent
+
+          export DEVSTACK_GATE_SETTINGS=/opt/stack/new/tap-as-a-service/devstack/devstackgaterc
+
+          cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
+          ./safe-devstack-vm-gate-wrap.sh
+
+    publishers:
+      - devstack-logs
+      - console-log

zuul/layout.yaml

@@ -8968,6 +8968,8 @@ projects:
       - name: merge-check
       - name: python-jobs
       - name: python3-jobs
+    experimental:
+      - gate-tempest-dsvm-tap-as-a-service
 
   - name: openstack/taskflow
     template: